By focusing on just two relevant bands, it’s possible to make an accurate multiband radiometer for a fraction of what a full-spectrum spectroradiometer costs. Apogee NDVI sensors are multiband radiometers that combine an ultra-rugged form with sophisticated cloud data delivery for an unbeatable price-to-performance ratio. They're inexpensive enough to deploy multiple sensors simultaneously, so you can maximize spatial coverage and explore spatial and temporal variability in canopy structure and function.
Most spectrometers are delicate and expensive, making long-term field deployment risky. Apogee NDVI sensors are built for long-term exposure to the elements. Encased in a durable housing with an epoxy fill, they are watertight, weatherproof, and have fully sealed optics. Mount them on a fence post, tripod, or a meteorological tower. They’re rugged enough to leave in the field for an entire growing season or longer.
Each 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.
To simplify your workflow, Apogee NDVI sensors are plug-and-play with ZL6 data loggers, which means automatic sensor recognition and zero programming. ZENTRA Cloud lets you monitor remote sites in near-real time from any internet-connected device. Observe field conditions, check and configure sensor and system function, or download data from the comfort of your home or office.
Apogee NDVI sensors are part of a complete system of affordable, easy-to-use sensors, loggers, and software that require little maintenance and put near-real-time data at your fingertips, so you can publish more and work less.
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|NDVI SENSOR SPECIFICATIONS|
|Power supply||5.5 to 24 V DC|
|Calibration factor (reciprocal of sensitivity)||Custom for each sensor and stored in firmware|
|Calibration uncertainty||± 5 %|
|Wavelength ranges||Red detector = 650 nm ± 5 nm with 65 nm FWHM|
NIR detector = 810 nm ± 5 nm with 65 nm FWHM
|Measurement range||2x full sunlight|
|Measurement repeatability||Less than 1 %|
|Long-term drift||Less than 2 % per year|
|Response time||Less than 0.6 s|
|Field of view||180°|
|Directional (cosine) response||± 2 % at 45°; ± 5 % at 75° zenith angle|
|Temperature response||Less than 0.1 % per C|
|Housing||Anodized aluminum body with acrylic window|
|Operating environment||-40 to 70 C; 0 to 100 % relative humidity|
|Dimensions||30.5 mm diameter, 34.5 mm height|
|Mass (with 5 m of cable)||140 g|
|Cable||5 m of shielded, twisted-pair wire with TPR jacket and stainless steel connector|
|Warranty||4 years against defects in materials and workmanship|
|Data logger compatibility (not exclusive)||METER EM60 series, ZL6 series, ZSC, ProCheck, Campbell Scientific|
|Apogee NDVI sensor manual||Manual||PDF, 0.9MB||Download Apogee NDVI sensor manual Manual|
|Using Apogee NDVI and PRI Sensors with ZENTRA System||Manual||PDF, 1.1MB||Download Using Apogee NDVI and PRI Sensors with ZENTRA System Manual|
|Meter Legacy SRS Spectral Reflectance Sensor Manual||Manual||PDF, 1.699MB||Download Meter Legacy SRS Spectral Reflectance Sensor Manual Manual|
|METER Legacy SRS Quick Start||Quickstart Guide||PDF, 0.46MB||Download METER Legacy SRS Quick Start Quickstart Guide|
|Meter Legacy Spectral Reflectance Sensor (SRS)(NVDI) Integrator Guide||Quickstart Guide||PDF, 0.643MB||Download Meter Legacy Spectral Reflectance Sensor (SRS)(NVDI) Integrator Guide Quickstart Guide|
|Meter Legacy Spectral Reflectance Sensor (SRS)(PRI) Integrator Guide||Quickstart Guide||PDF, 0.643MB||Download Meter Legacy Spectral Reflectance Sensor (SRS)(PRI) Integrator Guide Quickstart Guide|
|Anemometer Mast Assembly Instructions||Manual||PDF, 0.527MB||Download Anemometer Mast Assembly Instructions Manual|
|Legacy Apogee PRI Sensor Manual||Manual||PDF, 1.5MB||Download Legacy Apogee PRI Sensor Manual Manual|
Yes, you could check downward-facing sensor response in the field on a sunny day using a white panel. Ideally, a Spectralon panel should be used. The SRS field stop calibration check should be done with the field stop sensors pointing down at an angle toward a white Teflon panel or Spectralon panel, so that the field of view is totally encompassed by the white panel. Then, with the hemispherical sensors pointing up to collect irradiance data at the same location and time (with no obstructions in the field of view), radiance values * pi (3.14) should be approximately equal to irradiance values.
Radiance = Irradiance/pi
Irradiance = Radiance * pi
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