Radiometer Pool
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Keywords
Bidirectional Effects, Goniometry, Spectral Radiometry, BRDF, Laboratory
Abstract
The Radiometer Pool contains of different instruments for measuring the radiance, irradiance and transmittance. The instruments are:
- RTS-3ZC Integrating Sphere
- ASD FieldSpec-3
- ASD FieldSpec Pro FR
Instruments
RTS-3ZC Integrating Sphere
Parameter | Description |
Manufacturer | Analytical Spectral Devices Inc., Boulder (CO) USA |
Spectroradiometer characteristics | refer to used instrument * |
Interior diameter | 7.62 cm |
Interior material | Zenith diffuse reflectance PTFE |
Sphere geometry | 13°/D specular excluded reflectance |
Measured quantities | Specular included reflectance, Specular excluded reflectance, Transmittance |
Illumination source | Collimated tungsten light source with adjustable baffle; 10W, 6V |
Size, Weight | approx. 10 x 10 x 10cm, 1.5 kg |
Ports | 6 ports to accept supplied accessories (sample holders, light source, fiber optic adapter, light trap, port plugs) |
Reference standards | 2 nominal 99% Zenith reference standards (calibrated, uncalibrated) |
Battery Life / Voltage | 3 h / 12 V * |
Digitization | 16 Bit * |
Wavelength Accuracy / Repeatability | ±1 nm / ±0.1 nm * |
Spectrum Averaging | Yes, user defined * |
Dark Current Correction | Based on user defined measurement setup |
Operating Environment | 10 - 90 % Rel. Humidity, -10° to 50° C * |
* ASD FieldSpec-3
Purpose:
The RTS-3ZC integrating sphere collects optical radiation which has been reflected from or transmitted through a sample for the purpose of measuring reflectance or transmittance. The sphere is designed for use with an ASD FieldSpec spectroradiometer. The RTS-3ZC integrating sphere features a 13º/D geometry to allow near normal incidence at 13º and diffuse collection via the instrument’s fiber optic bundle. The interior of the integrating sphere is made of Zenith diffuse polymer material, a solid, machined form of PTFE. Zenith® is a highly reflective (>95%) and lambertian reflector over the broad spectral range of 350–2500 nm, which provides maximum efficiency and optical performance. A specially designed collimated tungsten light source, included with the sphere, delivers close to solar irradiance levels at the sample.
ASD FieldSpec-3
Parameter | Description |
Manufacturer | Analytical Spectral Devices Inc., Boulder (CO) USA |
Spectral Range | 350 - 2500 nm |
Channels | continuous |
Linear Arrays | (1) 512 Si, 350-1000nm |
Bandwidth | 1.4 nm (350 - 1050nm) |
Scan Time | 100 ms |
Field of View | Dependent on fore-optic |
Size, Weight | 35 x 29 x 13 cm / 5.2 kg |
Battery Life / Voltage | 3 h / 12 V |
Digitization | 16 Bit |
Wavelength Accuracy / Repeatability | ±1 nm / ±0.1 nm |
Spectrum Averaging | Yes, user defined |
Dark Current Correction | Automatic, based on user defined measurement prior to data take |
Operating Environment | 10 - 90 % Rel. Humidity, -10° to 50° C |
Control unit | Wireless remote control up to 150 feet away |
Purpose:
Field spectrometry is the quantitative measurement of radiance, irradiance or transmittance in the field. Portable, battery powered spectroradiometer, such as the ASD FieldSpec-3, are typically used to make these measurements. The instrument is equipped with a silicon photodiode array and two fast scanning thermoelectrically cooled spectrometers capable of data collection from 350 - 2500nm. One of the primary uses is the collection of field data for analysis of remotely sensed images of the earth's surface. The ASD FieldSpec-3 is operated using a wireless remote control reaching up to 150 feet. Two such instruments of the same type are positioned on the zenith arc of the goniometer system (dual-view FIGOS) in order to perform dual-view spectrodirectional measurements.
ASD FieldSpec Pro FR
Parameter | Description |
Manufacturer | Analytical Spectral Devices Inc., Boulder (CO) USA |
Spectral Range | 350 - 2500 nm |
Channels | continuous |
Linear Arrays | (1) 512 Si, 350-1000nm |
Bandwidth | 1.4 nm (350 - 1050nm) |
Scan Time | 100 ms |
Field of View | Dependent on fore-optic |
Size, Weight | 35 x 29 x 13 cm / 7.2 kg |
Battery Life / Voltage | 3 h / 12 V |
Digitization | 16 Bit |
Wavelength Accuracy / Repeatability | ± 1 nm / ± 0.1 nm |
Spectrum Averaging | Yes, user defined |
Dark Current Correction | Automatic, based on user defined measurement prior to data take |
Operating Environment | 10 - 90 % Rel. Humidity, -10° to 50° C |
Purpose:
Field spectrometry is the quantitative measurement of radiance, irradiance or transmittance in the field. Portable, battery powered spectroradiometer, such as the ASD FieldSpec-3, are typically used to make these measurements. The instrument is equipped with a silicon photodiode array and two fast scanning thermoelectrically cooled spectrometers capable of data collection from 350 - 2500nm. One of the primary uses is the collection of field data for analysis of remotely sensed images of the earth's surface. The ASD FieldSpec-3 is operated using a wireless remote control reaching up to 150 feet. Two such instruments of the same type are positioned on the zenith arc of the goniometer system (dual-view FIGOS) in order to perform dual-view spectrodirectional measurements.