Model SRS - Canopy Spectral Reflectance Sensor
From Supporting Sensors
Low cost, weatherproof radiometer: The Spectral Reflectance Sensor (SRS) is a matchbox-sized, multiband radiometer that can be mounted on a fence post, tripod, or meteorological tower. It’s inexpensive enough to deploy multiple sensors simultaneously. And it’s rugged enough to leave in the field for an entire growing season, or longer.
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Product Details
Most spectrometers are delicate and expensive, making long-term field deployment risky. The SRS is built for long-term exposure to the elements. Encased in a durable Geloy housing with an epoxy fill, it is water tight, weatherproof, with fully sealed optics. These materials and methods have been tested over months and years on other buried and above-ground sensors. Combined, these features help minimize drift in calibration over time.
Field ready and radiometrically calibratedEach sensor is radiometrically calibrated to a NIST-traceable standard. Readings are output in units of radiant flux density. Calibration information is stored on board the sensor, so you never have to worry about keeping track of calibration coefficients.
Continuously monitor NDVI or PRI at the plot scaleNDVI and PRI are calculated from measurements of of electromagnetic radiation reflected from canopy surfaces. They are correlated with canopy variables such as: light use efficiency (LUE), biomass and crop yield, crop and forest phenology, canopy growth, and photosynthetic performance/CO2 uptake. SRS sensors measure incident or reflected radiation in two bands. Normalized Difference Vegetation Index (NDVI) bands are centered at 650 nm and 810 nm with 50 nm and 40 nm full width half maximum (FWHM), respectively. Photochemical Reflectance Index (PRI) bands are centered at 532 nm and 570 nm with 10 nm FWHM.
Low cost for maximum spatial coverageBy focusing on just two bands, it’s possible to make an accurate multiband radiometer for a fraction of what a full-feature spectroradiometer costs. Use the SRS-NDVI and SRS-PRI sensors to maximize spatial coverage and explore spatial and temporal variability in canopy structure and function.
Collect data and monitor remotelyThe SRS is an SDI-12 digital sensor. When used with METER’s ZL6 data loggers, the SRS plugs in via stereo connector. Monitor remote sites from your office, phone, or any internet-connected device. Observe field conditions, check sensor and system function, or download data from sites that are difficult to access. METER’s database and graphing software can manage your data set and will calculate NDVI or PRI automatically. The SRS sensor is also compatible with Campbell Scientific and other SDI-12 capable data loggers.
Technical Specifications
- NDVI wavebands: 650 ± 2 and 810 ± 2 nm peak wavelengths, with 10 nm and 10 nm full width half maximum (FWHM) band widths
- PRI wavebands: 532 ± 2 and 570 ± 2 nm peak wavelengths, with 10 nm full width half maximum (FWHM) band widths
- Foreoptics:
- Cosine correcting Teflon diffuser, hemispherical field of view
- Field stop, 36° field of view
- Calibration: NIST traceable calibration to known spectral irradiance (W m-2 nm-2 nm-1 sr-1)
- Accuracy: 10% or better for spectral irradiance and radiance values
- Measurement time: ~ 600 ms
- Dimensions: 43 x 40 x 27mm
- Weight
- Sensor: 47 g
- Sensor with 5 m cable: 170 g
- Power requirements: 3.6 to 15 VDC, 4 mA (reading, 300 ms), 30µA (quiescent)
- Operating temperature range: -40 to 50 °C
- Cable length: 5 m standard, custom cable length available upon request
- Connector type: 3.5 mm (stereo) plug or stripped and tinned lead wires (pigtail)
- Communication: SDI-12 digital sensor
- Data logger compatibility (not exclusive): METER Em50 series, EM60 series, ZL6 series, ZSC, ProCheck, Campbell Scientific
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