| Zugriffsnummer | 21797 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Determination of the spectral responsivity of THz detectors with blackbody radiation |
| Autor(in); Institution |
Gutschwager, Berndt; 7.3, Hochtemperatur- und Vakuumphysik, PTB-Berlin
Monte, Christian; 7.3, Hochtemperatur- und Vakuumphysik, PTB-Berlin
Hollandt, Jörg; 7.3, Hochtemperatur- und Vakuumphysik, PTB-Berlin
Delsim-Hashemi, H.; Universität Hamburg, GERMANY
Grimm, O.; Universität Hamburg, GERMANY
|
| Quelle/Jahr | Sensor + test 2008 proceedings:(2008), 297 - 302 |
| ISBN | 978-3-9810993-3-1 |
| Verlag | Wunstorf: AMA Service GmbH |
| Konferenzangaben | OPTO 2008, Photonic Metrology, 8th International Conference on Optical Technologies for Sensing and Measurement ; IRS2 2008 International Conference on Infrared Sensors and Systems, Nürnberg, 06-08, May, 2008, Germany |
| Freie Schlagworte | spectral responsivity ; THz detector ; THz emissivity ; THz blackbody ; THz filter |
| Zusammenfassung | The spectral responsivity of the detector is important for the layout and quantitative interpretation of spectroscopic experiments. In the THz spectral range the knowledge of the total (integral) responsivity of a detector, as well as its spectral distribution, is often insufficient. PTB determined the spectral responsivity of two THz detectors, a pyroelectric DLATGS detector working at room temperature and a silicon-composite bolometer working at 4 K, in the wavelength range from 50 μm to 600 μm with temperature radiation from blackbody radiators. Our approach is to use two THz cavity radiators in combination with THz bandpass filters to provide calculable spectral radiation fluxes, according to Planck’s law of radiation, at several wavelength bands in the THz spectral range. One cavity radiator is working at an adjustable fixed temperature in the range from 15 °C to 90 °C while the other cavity radiator operates at LN2 temperature. The radiation of the two cavity radiators is alternately imaged on the detector via a gold coated chopper wheel. Hereby the background radiation is cancelled and also the necessary modulation for the lock-in detection is provided. The cavity of the high temperature radiator is coated with a dedicated paint providing high wall emissivity in the FIR and THz spectral range to ensure true blackbody behavior of the radiator. The bottom of the low temperature radiator consists of THz absorber foam providing hereby also nearly blackbody behavior. All individual filters and, additionally, the employed filter combinations are characterized for their transmittance in the entire wavelength range from 0.8 μm to 1700 μm to obtain a precise knowledge of the transmitted blackbody spectrum. The well reproducible results indicate that this setup allows a fast, simple and reliable determination of the spectral responsivity of THz detectors. In a next step, the uncertainty of this technique will be further evaluated and investigations will be extended to other types of detectors (e.g. LiTaO detectors and Golay cells). |
Zitierung
Gutschwager, B., Monte, C., Hollandt, J., Delsim-Hashemi, H., & Grimm, O. (2008). Determination of the spectral responsivity of THz detectors with blackbody radiation. OPTO 2008, Photonic Metrology, 8th International Conference on Optical Technologies for Sensing and Measurement ; IRS2 2008 International Conference on Infrared Sensors and Systems, Nürnberg, 06-08, May, 2008, Germany.