Evaluation of portable Raman spectrometer with 1064 nm excitation for geological and forensic applications (original) (raw)

Portable Raman spectrometer - design rules and applications

Bulletin of the Polish Academy of Sciences: Technical Sciences, 2011

Portable Raman spectrometer - design rules and applications Raman spectroscopy has become more popular due to its new prospective field applications in forensic sciences, war against terrorism, environment protection and other field chemical analysis. Raman spectrometers can be miniaturised to portable devices and their price is decreasing due to development of optoelectronics components. Unfortunately, this technology has still numerous limitations that influence their design and limit the scope of possible applications. The conception and design of the portable Raman spectrometer is described, including discussion of performance and limitations of representative components of such device available on the market. An enhanced portable Raman spectrometer using two lasers, one emitting at 355 nm and the other at 785 nm, and employing advanced signal acquisition and data processing methods is presenented. Advantages of such system are outlined and example measurement results acquired u...

Remote Raman measurements of minerals, organics, and inorganics at 430 m range

Applied optics, 2016

Raman spectroscopy is a characterization technique that is able to analyze and detect water or water-bearing minerals, minerals, and organic materials that are of special interest for planetary science. Using a portable pulsed remote Raman system with a commercial 8 in. (203.2 mm) telescope, a frequency doubled Nd-YAG-pulsed laser, and a spectrometer equipped with an intensified CCD camera, we acquired good quality Raman spectra of various materials from a 430 m standoff distance during daylight with detection times of 1-10 s, in a realistic context in which both the exciting source and the detector are part of the same measurement system. Remote Raman spectra at this distance provided unambiguous detection of compounds such as water and water ice, dry ice, sulfur, sulfates, various minerals and organics, and atmospheric gases. This research work demonstrates significant improvement in the remote Raman technique as well as its suitability for solar system exploration.

Mix and match: enhanced Raman spectroscopy instrumentation in field applications

2008

We present Raman spectroscopy analysis on laboratory and field sample analysis on several expeditions. Our measurements in mineral and organic composition have demonstrated that both mineral and organic species in low concentrations can be identified with Raman spectroscopy with no sample preparations and without instrument probe contact to the samples. Our laboratory studies on cyanobacterial biomat, and Mojave Desert rocks have demonstrated the promising potential for Raman spectroscopy as a nondestructive, in situ, high throughput detection technique, as well as a desirable active remote sensing tool for future planetary and space missions.