Spectral induced polarisation (original) (raw)
Spectral induced polarization (SIP), or complex resistivity (CR) and also complex conductivity (CC), is a geophysical survey technique and an extension of the induced polarization (IP) method, being itself an extension of measuring the Earth's resistance at a single frequency or under direct current (DC) (a technique commonly known by the name resistivity). SIP measures the frequency-dependent (i.e. spectral) complex impedance, equivalent to the amount of resistance and phase shift between electric current and voltage. The usual frequency range for alternating current (AC) applied during SIP surveys is tens of kHz to MHz. As with other geophysical methods, SIP aims to distinguish material properties of the subsurface, such as salinity and saturation.
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| dbo:abstract | Spektrale Induzierte Polarisation (SIP) ist die in der Geophysik übliche Bezeichnung für impedanzspektroskopische Messungen (Spezialfall einer geoelektrischen Messung). Dabei werden in Abhängigkeit von der Frequenz eines in den Boden eingespeisten Signals (angelegte Wechsel-Spannung bzw. eingespeister -Strom, i. d. R. Sinus-förmig) der elektrische Widerstand und die Phase zwischen elektrischem Strom und Spannung gemessen, alternativ Real- und Imaginärteil. Der übliche Frequenzbereich erstreckt sich von einigen zehn Kilohertz hinab zu Millihertz. Aus der frequenzabhängigen Phase, dem Phasen-Spektrum, können Informationen gewonnen werden zusätzlich zu den sonst mittels Gleichstrom-Geoelektrik ermittelten Widerstands-Beträgen (Amplitude). Forschung zielt hierbei besonders auf Material-Eigenschaften, Salinität und Wassersättigung ab. SIP wird auch an Baumaterialien, Bäumen und in der Medizin angewandt. Im Arbeitskreis Induzierte Polarisation der Deutschen Geophysikalischen Gesellschaft e. V. werden „Informationen über vorhandenen Erfahrungen, Daten, Literatur und Apparaturen aus[ge]tausch[t], an Standards und Referenzmaterialien [ge]arbeite[t] sowie Ideen für weitere Arbeiten und gemeinsame Projekte [ge]sammel[t].“ (de) Spectral induced polarization (SIP), or complex resistivity (CR) and also complex conductivity (CC), is a geophysical survey technique and an extension of the induced polarization (IP) method, being itself an extension of measuring the Earth's resistance at a single frequency or under direct current (DC) (a technique commonly known by the name resistivity). SIP measures the frequency-dependent (i.e. spectral) complex impedance, equivalent to the amount of resistance and phase shift between electric current and voltage. The usual frequency range for alternating current (AC) applied during SIP surveys is tens of kHz to MHz. As with other geophysical methods, SIP aims to distinguish material properties of the subsurface, such as salinity and saturation. (en) |
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| dbp:cs1Dates | y (en) |
| dbp:date | January 2022 (en) |
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| gold:hypernym | dbr:Technique |
| rdf:type | dbo:TopicalConcept |
| rdfs:comment | Spectral induced polarization (SIP), or complex resistivity (CR) and also complex conductivity (CC), is a geophysical survey technique and an extension of the induced polarization (IP) method, being itself an extension of measuring the Earth's resistance at a single frequency or under direct current (DC) (a technique commonly known by the name resistivity). SIP measures the frequency-dependent (i.e. spectral) complex impedance, equivalent to the amount of resistance and phase shift between electric current and voltage. The usual frequency range for alternating current (AC) applied during SIP surveys is tens of kHz to MHz. As with other geophysical methods, SIP aims to distinguish material properties of the subsurface, such as salinity and saturation. (en) Spektrale Induzierte Polarisation (SIP) ist die in der Geophysik übliche Bezeichnung für impedanzspektroskopische Messungen (Spezialfall einer geoelektrischen Messung). Dabei werden in Abhängigkeit von der Frequenz eines in den Boden eingespeisten Signals (angelegte Wechsel-Spannung bzw. eingespeister -Strom, i. d. R. Sinus-förmig) der elektrische Widerstand und die Phase zwischen elektrischem Strom und Spannung gemessen, alternativ Real- und Imaginärteil. Der übliche Frequenzbereich erstreckt sich von einigen zehn Kilohertz hinab zu Millihertz. Aus der frequenzabhängigen Phase, dem Phasen-Spektrum, können Informationen gewonnen werden zusätzlich zu den sonst mittels Gleichstrom-Geoelektrik ermittelten Widerstands-Beträgen (Amplitude). Forschung zielt hierbei besonders auf Material-Eigensc (de) |
| rdfs:label | Spektrale Induzierte Polarisation (de) Spectral induced polarisation (en) |
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