Installed photosynthetic photon sensor
The 【WPLP-PAR-01】 measures the number of light quanta incident on a surface per second in the spectral range of 400 to 700 nm, and the ratio to the unit area (m²). This quantity is defined as PAR, or Photosynthetically Active Radiation. The calibration of the probe is performed using a halogen lamp, with specific spectra being referenced against known spectral radiation. The spectral response of the probe is slightly affected by temperature. Thanks to the special structure of the diffuser and probe, it also responds to changes in the angle of incidence on the diffuser, which is corrected for the cosine law. The outdoor installation type is the MC8P-PHOT3S series.
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basic information
■mV Signal Output In the spectral regions of VIS-NIR, UVA, UVB, and UVC, light and radiation amounts are measured as illuminance (lux) or irradiance (W/m²). Additionally, it is possible to measure the number of photons per unit time and per unit area in the photosynthetically active radiation (PAR) wavelength range of 400–700 nm. The WPLP series does not require an external power supply. The output signal in mV is obtained through the shunt resistance of the photodiode terminal. The photocurrent generated when the photodiode receives light is converted into a potential difference and read by a voltmeter. Once the potential difference (PD) is read, the measurement is calculated using a calibration factor (output coefficient).
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Applications/Examples of results
Each probe is calibrated at the factory before shipment and has a unique calibration coefficient (output coefficient). This coefficient is indicated on the individual probes and in the accompanying instruction manual. The WPLP series probes are equipped with cosine-correcting diffusers. For UV measurement probes, the diffuser is made of polished quartz, while other probes are made of acrylic or Teflon (WPLP-PHOTO-01). The WPLP series probes are designed for continuous monitoring of the above light and radiation levels, intended for measurements indoors or outdoors (excluding UV measurement models).
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