LED pulse light source type crop canopy vegetation index determining system
A measurement system, pulsed light source technology, applied in measurement devices, measurement of scattering properties, material analysis by optical means, etc., to achieve the effects of less optical channels, good stability, and strong practicability
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[0051] The present invention will be further described below in conjunction with the accompanying drawings.
[0052] Such as figure 1 As shown, the LED pulse light source crop canopy vegetation index measurement system includes three parts: a sensor, a controller and a power circuit. The sensor includes an active light source module, an optical system module, a signal conditioning and sampling module.
[0053] The active light source module is equipped with a group of red LEDs, a group of near-infrared LEDs and a pulse drive circuit, and the pulse drive circuit is controlled by the controller to output pulse signals to alternately drive the red LED group and the near-infrared LED group, so that the red LED group and the near-infrared LED group The infrared LED group realizes alternate light emission and pulse flashing, as an active LED pulse light source. The circuit diagram of the active light source module is shown in figure 2 As shown, the pulse drive circuit uses two LE...
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