Dario Cabib - Academia.edu (original) (raw)

Papers by Dario Cabib

Research paper thumbnail of I. Statistical mechanics of the Half-Filled Band Hubbard model. II. Random exchange Ising chains

Research paper thumbnail of Method for simultaneous detection of multiple fluorophores for in situ hybridization and multicolor chromosome painting and banding

Research paper thumbnail of Method for remote sensing analysis be decorrelation statistical analysis and hardware therefor

Research paper thumbnail of Sky Radiance at Wavelengths Between 7-MICRONS and 14-MICRONS Measurement Calculation and Comparison with LOWTRAN-4 Predictions

Research paper thumbnail of Statistical physics - Statphys_13. Part_I. Conference held at Haifa, Israel, 24_-_30 August 1977

Research paper thumbnail of New airborne pushbroom spectral imager for the 3-5 and 7-12 µ wavelength ranges

A large variety of airborne spectral imagers have been designed and built in recent years for env... more A large variety of airborne spectral imagers have been designed and built in recent years for environment and earth resource mapping applications. CI has developed a new design of an infrared version of such instrument, with the following advantages: i) it is appropriate for both Mid Wave (MWIR or 3-5 µ) and Long Wave (LWIR or 8-12 µ) infrared wavelength ranges, and ii) it has no moving parts, and is especially efficient in signal collection in the MWIR, where the number of photons reaching the detector from room temperature objects is low. In this paper we show the principle of operation of a Sagnac interferometer based spectral imager, together with the most important optical parameters used in the present design. The system is mounted on a stabilization gimbal (with higher performance in pitch) to preserve signal to noise ratio and the required spatial and spectral resolution of the measurement: stabilization control is 50 microradians in pitch, and 0.5 milliradians in yaw and ro...

Research paper thumbnail of Broad-band optical test bench (OPTISHOP) to measure MTF and transmittance of visible and IR optical components

SPIE Proceedings, 2007

CI Systems has developed a new cost effective and modular Optical Test Bench to measure Modulatio... more CI Systems has developed a new cost effective and modular Optical Test Bench to measure Modulation Transfer Function (MTF) and transmittance of optical components in the Visible/Near Infrared (0.4-1.7 microns) and infrared (3 to 14 microns) spectral ranges (the OPTISHOP system). The optical design concept of the system allows the user to switch from MTF (on-and off-axis) to transmittance measurements, without need of optical alignment by the user. In addition, broad band sources are used for illumination, so that these optical properties can be measured in the whole relevant wavelength range of the components to be tested (usually visible and/or near infrared separately from the infrared range). Other lens measurements such as effective focal length can be made. Back focal length, distortion and field curvature are being developed. The system is based on the standard and proven CTS (Collimator Test System) product line of CI, which is made of reflective optics for wide wavelength coverage, and it is ruggedly built for use in the laboratory, production line or maintenance depot. An advantage of the CTS configuration is that the source-collimator assembly is enclosed in a robust mechanical envelope, which prevents accidental misalignements and breakage, optical misalignments due to environment temperature drifts, soiling of the optics, and easier system transportation. The system is described here, including calibration and validation techniques.

Research paper thumbnail of <title>Computerized Infrared Spectroradiometry: A Computerized Systems Approach</title>

Infrared Technology XI, 1985

ABSTRACT

Research paper thumbnail of A Radiometric Method Of Calibrating Infrared Sources, Using The SR 5000 Infrared Spectroradiometer

SPIE Proceedings, 1988

ABSTRACT

Research paper thumbnail of Molecular ordering in the smectic- E phase in the molecular-field approximation

Physical Review A, 1978

The smectic-8 to smectic-E transition is discussed in terms of an orientational intermolecular po... more The smectic-8 to smectic-E transition is discussed in terms of an orientational intermolecular potential recently suggested by Meyer. Within the framework of the molecular-field approximation the transition temperature is obtained from the lowest eigenvalue of an Hermitian matrix, and the ordered state below it is described by the corresponding eigenvector. A condition is found for which the experimentally observed herringbone structure is the most stable one.

Research paper thumbnail of <title>State-of-the-art transfer radiometer for testing and calibration of FLIR test equipment</title>

Infrared Technology XVII, 1991

Research paper thumbnail of Electrical conductivity of the narrow-half-filled-band Hubbard model with nearest-neighbor interaction

Physical Review B, 1975

The recent theoretical work on the one-dimensional Hubbard model showed this to be inadequate to ... more The recent theoretical work on the one-dimensional Hubbard model showed this to be inadequate to explain the properties of n-methyl phenazinium tetracyanoquino dimethane (NMP-TCNQ) in the regime of narrow bandwidth compared to Coulomb repulsion; however, it also supported the suggestion existing in the literature that it is possible to fit both the magnetic susceptibility and the low-T activation energy of the electrical conductivity by introducing a temperature dependence in the parameters of the Hamiltonian. Since the Hubbard Hamiltonian neglects important interactions (long-range Coulomb repulsion, electron-lattice interaction, etc.), it is reasonable to think that these interactions may be responsible for this temperature dependence. In this paper I add to the Hubbard Hamiltonian a nearest-neighbor Coulomb interaction and calculate the electrical conductivity in the narrow-bandwidth regime.

Research paper thumbnail of Source of the metallic conductivity in tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ)

Physical Review B, 1976

ABSTRACT

Research paper thumbnail of Phenomenological theory of the polarized helicoidal smectic C phase

Physical Review A, 1977

ABSTRACT

Research paper thumbnail of <title>New automatic testing system for today's airborne laser sensors</title>

Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XIX, 2008

ABSTRACT Modern laser sensors are becoming more and more sophisticated in their capabilities, inc... more ABSTRACT Modern laser sensors are becoming more and more sophisticated in their capabilities, including direction, distance, threat type detection and other parameters. They are also becoming more specific and less affected by confusing environment signals such as sun illumination and other threat-unrelated sources. As a result, the testing needs in development and production are also becoming more demanding. CI Systems&#39; new AEOT (Automatic Electro-Optic System) is an easy to use, computer controlled instrument, which is suitable for testing laser sensors in R&amp;D and high volume production, in their important aspects. The general instrument design and functionality are presented in this paper.

Research paper thumbnail of Electric field induced tricritical point in chiral polarized liquid crystals

Journal de Physique Lettres, 1977

2014 On présente une théorie de la transition entre un smectique C polarisé uniformément et un sm... more 2014 On présente une théorie de la transition entre un smectique C polarisé uniformément et un smectique C* hélicoïdal en présence d'un champ électrique parallèle aux couches, en utilisant la théorie de Landau. Le diagramme de phase (champ électrique-température) a un point tricritique (Et, Tt). Les valeurs de Et et Tt sont exprimées en fonction des propriétés macroscopiques du matériau. Abstract. 2014 We present a Landau theory of the transition between a uniformly polarized smectic C phase and a distorted smectic C* phase in the presence of an electric field parallel to the layers. The field-temperature (E-T) phase diagram is shown to exhibit a tricritical point (Et, Tt). The values of Et, Tt are expressed in terms of observable macroscopic properties of the material.

Research paper thumbnail of <title>Boresighting of laser range finder or designator systems with and without laser/FLIR synchronization</title>

Infrared Technology XVI, 1990

We have conducted experiments to prove feasibility of a boresighting method between a laser and a... more We have conducted experiments to prove feasibility of a boresighting method between a laser and a Forward Looking Infra-Red (FLIR) system, which has the advantage of working with or without synchronization between the laser pulses and the FLIR scanning. The method is based on the Thermal Target concept (TT); the laser energy is focused on a special substrate which is locally heated and produces a point image on the FLIR screen with respect to the FLIR line of sight which is boresighted. Resistance to laser damage by the required pulse energy densities was established by target lifetime measureiaents. The TT method can be also used for real time boresighting of the laser with the FLIR, which means that the boresighting is done while looking at the scenery.

Research paper thumbnail of Charge order and antiferromagnetic order in the Hubbard model with nearest-neighbor Coulomb interaction: Weak coupling

Research paper thumbnail of <title>Electro-optical systems to accurately align (boresight) laser designator, FLIR, and CCD on the ground before the mission</title>

Electro-Optical and Infrared Systems: Technology and Applications V, 2008

ABSTRACT CI Systems has been involved in the development and production of in-flight boresight eq... more ABSTRACT CI Systems has been involved in the development and production of in-flight boresight equipment since 19891,2, by pioneering the field with innovative laser-FLIR and laser-CCD alignment solutions. In addition, over the years we have developed a number of systems for use on the ground to align the various electro-optical instrumentation to a common Line of Sight (LOS) before the mission. This adjustment is very important for the success of the mission: the more accurate the alignment and its retention during the flight, the better the chance of a precise hit. In this paper we describe various systems developed and built at CI for use with EO pods mounted on aircraft, especially UAV&#39;s. The most important engineering tasks are design for small size and convenient mechano-optical interfaces for different pods allowing system compactness, low weight and easy operation. Some of the design considerations to meet these challenges will be given here.

Research paper thumbnail of <title>Long wave infrared (8 to 14 microns) hyperspectral imager based on an uncooled thermal camera and the traditional CI block interferometer (SI-LWIR-UC)</title>

Infrared Technology and Applications XXXVII, 2011

ABSTRACT Since the early &#39;90&#39;s CI has been involved in the development of FTIR hy... more ABSTRACT Since the early &#39;90&#39;s CI has been involved in the development of FTIR hyperspectral imagers based on a Sagnac or similar type of interferometer. CI also pioneered the commercialization of such hyperspectral imagers in those years. After having developed a visible version based on a CCD in the early &#39;90&#39;s (taken on by a spin-off company for biomedical applications) and a 3 to 5 micron infrared version based on a cooled InSb camera in 2008, it is now developing an LWIR version based on an uncooled camera for the 8 to 14 microns range. In this paper we will present design features and expected performance of the system. The instrument is designed to be rugged for field use, yield a relatively high spectral resolution of 8 cm-1, an IFOV of 0.5 mrad., a 640x480 pixel spectral cube in less than a minute and a noise equivalent spectral radiance of 40 nW/cm2/sr/cm-1 at 10mu. The actually measured performance will be presented in a future paper.

Research paper thumbnail of I. Statistical mechanics of the Half-Filled Band Hubbard model. II. Random exchange Ising chains

Research paper thumbnail of Method for simultaneous detection of multiple fluorophores for in situ hybridization and multicolor chromosome painting and banding

Research paper thumbnail of Method for remote sensing analysis be decorrelation statistical analysis and hardware therefor

Research paper thumbnail of Sky Radiance at Wavelengths Between 7-MICRONS and 14-MICRONS Measurement Calculation and Comparison with LOWTRAN-4 Predictions

Research paper thumbnail of Statistical physics - Statphys_13. Part_I. Conference held at Haifa, Israel, 24_-_30 August 1977

Research paper thumbnail of New airborne pushbroom spectral imager for the 3-5 and 7-12 µ wavelength ranges

A large variety of airborne spectral imagers have been designed and built in recent years for env... more A large variety of airborne spectral imagers have been designed and built in recent years for environment and earth resource mapping applications. CI has developed a new design of an infrared version of such instrument, with the following advantages: i) it is appropriate for both Mid Wave (MWIR or 3-5 µ) and Long Wave (LWIR or 8-12 µ) infrared wavelength ranges, and ii) it has no moving parts, and is especially efficient in signal collection in the MWIR, where the number of photons reaching the detector from room temperature objects is low. In this paper we show the principle of operation of a Sagnac interferometer based spectral imager, together with the most important optical parameters used in the present design. The system is mounted on a stabilization gimbal (with higher performance in pitch) to preserve signal to noise ratio and the required spatial and spectral resolution of the measurement: stabilization control is 50 microradians in pitch, and 0.5 milliradians in yaw and ro...

Research paper thumbnail of Broad-band optical test bench (OPTISHOP) to measure MTF and transmittance of visible and IR optical components

SPIE Proceedings, 2007

CI Systems has developed a new cost effective and modular Optical Test Bench to measure Modulatio... more CI Systems has developed a new cost effective and modular Optical Test Bench to measure Modulation Transfer Function (MTF) and transmittance of optical components in the Visible/Near Infrared (0.4-1.7 microns) and infrared (3 to 14 microns) spectral ranges (the OPTISHOP system). The optical design concept of the system allows the user to switch from MTF (on-and off-axis) to transmittance measurements, without need of optical alignment by the user. In addition, broad band sources are used for illumination, so that these optical properties can be measured in the whole relevant wavelength range of the components to be tested (usually visible and/or near infrared separately from the infrared range). Other lens measurements such as effective focal length can be made. Back focal length, distortion and field curvature are being developed. The system is based on the standard and proven CTS (Collimator Test System) product line of CI, which is made of reflective optics for wide wavelength coverage, and it is ruggedly built for use in the laboratory, production line or maintenance depot. An advantage of the CTS configuration is that the source-collimator assembly is enclosed in a robust mechanical envelope, which prevents accidental misalignements and breakage, optical misalignments due to environment temperature drifts, soiling of the optics, and easier system transportation. The system is described here, including calibration and validation techniques.

Research paper thumbnail of <title>Computerized Infrared Spectroradiometry: A Computerized Systems Approach</title>

Infrared Technology XI, 1985

ABSTRACT

Research paper thumbnail of A Radiometric Method Of Calibrating Infrared Sources, Using The SR 5000 Infrared Spectroradiometer

SPIE Proceedings, 1988

ABSTRACT

Research paper thumbnail of Molecular ordering in the smectic- E phase in the molecular-field approximation

Physical Review A, 1978

The smectic-8 to smectic-E transition is discussed in terms of an orientational intermolecular po... more The smectic-8 to smectic-E transition is discussed in terms of an orientational intermolecular potential recently suggested by Meyer. Within the framework of the molecular-field approximation the transition temperature is obtained from the lowest eigenvalue of an Hermitian matrix, and the ordered state below it is described by the corresponding eigenvector. A condition is found for which the experimentally observed herringbone structure is the most stable one.

Research paper thumbnail of <title>State-of-the-art transfer radiometer for testing and calibration of FLIR test equipment</title>

Infrared Technology XVII, 1991

Research paper thumbnail of Electrical conductivity of the narrow-half-filled-band Hubbard model with nearest-neighbor interaction

Physical Review B, 1975

The recent theoretical work on the one-dimensional Hubbard model showed this to be inadequate to ... more The recent theoretical work on the one-dimensional Hubbard model showed this to be inadequate to explain the properties of n-methyl phenazinium tetracyanoquino dimethane (NMP-TCNQ) in the regime of narrow bandwidth compared to Coulomb repulsion; however, it also supported the suggestion existing in the literature that it is possible to fit both the magnetic susceptibility and the low-T activation energy of the electrical conductivity by introducing a temperature dependence in the parameters of the Hamiltonian. Since the Hubbard Hamiltonian neglects important interactions (long-range Coulomb repulsion, electron-lattice interaction, etc.), it is reasonable to think that these interactions may be responsible for this temperature dependence. In this paper I add to the Hubbard Hamiltonian a nearest-neighbor Coulomb interaction and calculate the electrical conductivity in the narrow-bandwidth regime.

Research paper thumbnail of Source of the metallic conductivity in tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ)

Physical Review B, 1976

ABSTRACT

Research paper thumbnail of Phenomenological theory of the polarized helicoidal smectic C phase

Physical Review A, 1977

ABSTRACT

Research paper thumbnail of <title>New automatic testing system for today's airborne laser sensors</title>

Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XIX, 2008

ABSTRACT Modern laser sensors are becoming more and more sophisticated in their capabilities, inc... more ABSTRACT Modern laser sensors are becoming more and more sophisticated in their capabilities, including direction, distance, threat type detection and other parameters. They are also becoming more specific and less affected by confusing environment signals such as sun illumination and other threat-unrelated sources. As a result, the testing needs in development and production are also becoming more demanding. CI Systems&#39; new AEOT (Automatic Electro-Optic System) is an easy to use, computer controlled instrument, which is suitable for testing laser sensors in R&amp;D and high volume production, in their important aspects. The general instrument design and functionality are presented in this paper.

Research paper thumbnail of Electric field induced tricritical point in chiral polarized liquid crystals

Journal de Physique Lettres, 1977

2014 On présente une théorie de la transition entre un smectique C polarisé uniformément et un sm... more 2014 On présente une théorie de la transition entre un smectique C polarisé uniformément et un smectique C* hélicoïdal en présence d'un champ électrique parallèle aux couches, en utilisant la théorie de Landau. Le diagramme de phase (champ électrique-température) a un point tricritique (Et, Tt). Les valeurs de Et et Tt sont exprimées en fonction des propriétés macroscopiques du matériau. Abstract. 2014 We present a Landau theory of the transition between a uniformly polarized smectic C phase and a distorted smectic C* phase in the presence of an electric field parallel to the layers. The field-temperature (E-T) phase diagram is shown to exhibit a tricritical point (Et, Tt). The values of Et, Tt are expressed in terms of observable macroscopic properties of the material.

Research paper thumbnail of <title>Boresighting of laser range finder or designator systems with and without laser/FLIR synchronization</title>

Infrared Technology XVI, 1990

We have conducted experiments to prove feasibility of a boresighting method between a laser and a... more We have conducted experiments to prove feasibility of a boresighting method between a laser and a Forward Looking Infra-Red (FLIR) system, which has the advantage of working with or without synchronization between the laser pulses and the FLIR scanning. The method is based on the Thermal Target concept (TT); the laser energy is focused on a special substrate which is locally heated and produces a point image on the FLIR screen with respect to the FLIR line of sight which is boresighted. Resistance to laser damage by the required pulse energy densities was established by target lifetime measureiaents. The TT method can be also used for real time boresighting of the laser with the FLIR, which means that the boresighting is done while looking at the scenery.

Research paper thumbnail of Charge order and antiferromagnetic order in the Hubbard model with nearest-neighbor Coulomb interaction: Weak coupling

Research paper thumbnail of <title>Electro-optical systems to accurately align (boresight) laser designator, FLIR, and CCD on the ground before the mission</title>

Electro-Optical and Infrared Systems: Technology and Applications V, 2008

ABSTRACT CI Systems has been involved in the development and production of in-flight boresight eq... more ABSTRACT CI Systems has been involved in the development and production of in-flight boresight equipment since 19891,2, by pioneering the field with innovative laser-FLIR and laser-CCD alignment solutions. In addition, over the years we have developed a number of systems for use on the ground to align the various electro-optical instrumentation to a common Line of Sight (LOS) before the mission. This adjustment is very important for the success of the mission: the more accurate the alignment and its retention during the flight, the better the chance of a precise hit. In this paper we describe various systems developed and built at CI for use with EO pods mounted on aircraft, especially UAV&#39;s. The most important engineering tasks are design for small size and convenient mechano-optical interfaces for different pods allowing system compactness, low weight and easy operation. Some of the design considerations to meet these challenges will be given here.

Research paper thumbnail of <title>Long wave infrared (8 to 14 microns) hyperspectral imager based on an uncooled thermal camera and the traditional CI block interferometer (SI-LWIR-UC)</title>

Infrared Technology and Applications XXXVII, 2011

ABSTRACT Since the early &#39;90&#39;s CI has been involved in the development of FTIR hy... more ABSTRACT Since the early &#39;90&#39;s CI has been involved in the development of FTIR hyperspectral imagers based on a Sagnac or similar type of interferometer. CI also pioneered the commercialization of such hyperspectral imagers in those years. After having developed a visible version based on a CCD in the early &#39;90&#39;s (taken on by a spin-off company for biomedical applications) and a 3 to 5 micron infrared version based on a cooled InSb camera in 2008, it is now developing an LWIR version based on an uncooled camera for the 8 to 14 microns range. In this paper we will present design features and expected performance of the system. The instrument is designed to be rugged for field use, yield a relatively high spectral resolution of 8 cm-1, an IFOV of 0.5 mrad., a 640x480 pixel spectral cube in less than a minute and a noise equivalent spectral radiance of 40 nW/cm2/sr/cm-1 at 10mu. The actually measured performance will be presented in a future paper.