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Chlorophyll measuring apparatus based on RGB (red, green and blue) digital signal

A digital signal and measuring instrument technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of limited absorbance information and low measurement accuracy, and achieve the effects of accurate measurement of chlorophyll content, simple light source, and portability

Inactive Publication Date: 2009-10-14
TIANJIN UNIV
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Problems solved by technology

Because the SPAD502 only uses two bands of light to measure, the absorbance information obtained is limited, so the measurement accuracy is low

Method used

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  • Chlorophyll measuring apparatus based on RGB (red, green and blue) digital signal
  • Chlorophyll measuring apparatus based on RGB (red, green and blue) digital signal
  • Chlorophyll measuring apparatus based on RGB (red, green and blue) digital signal

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with accompanying drawing and example.

[0023] (1) Functional modules and circuits of the instrument

[0024] The chlorophyll measuring instrument of this example has a structure such as figure 1 As shown, it includes LED light source module, digital signal sensor module, digital signal processing control module, U disk data storage module, LCD liquid crystal display module, and the mechanical structure part of the instrument. The test light source is a full-band white LED, and the light source module is used to drive the LED to make the LED emit a stable test white light; the test white light hits the plant leaves vertically and passes through the plant leaves to be received by the main chip TCS230 of the digital signal sensor module. TCS230 contains corresponding There are three kinds of filters for red light (R), green light (G) and blue light (B). The filters are selected in time-sharing, and the...

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Abstract

The invention belongs to the technical field of photoelectric measurement, relating to a chlorophyll measuring apparatus. A mechanical structure part of the device comprises a light source, a T-shaped object stage and a sensor seat, wherein the light source contains a white light LED, the bottom of the sensor seat is provided with a color sensor, and a photophobic probe structure is formed by the light source, the object stage and the sensor seat; a circuit part of the apparatus comprises a light source module driving the white light LED, a digital signal sensor module and a digital signal processing and controlling module; the digital signal sensor module collects the light intensity information of red light, green light and blue light in probe light transmitting an object to be measured at different time by the color sensor, and transforms light intensity signals into square signals for outputting; the digital signal processing and controlling module captures the three square signals so as to obtain frequency signals representing the light intensity information of red light, green light and blue light, and simultaneously calculates the chlorophyll content in the objected to be measured according to the multiplex linear regression equation between the three frequency signals and the chlorophyll content. The apparatus has the advantages of simple and stable lighting source, relatively accurate measured chlorophyll content and the like.

Description

technical field [0001] The invention belongs to the technical field of photoelectric measurement, and relates to an optical and electronic measuring instrument for measuring plant chlorophyll content, in particular to a chlorophyll measuring instrument based on digital signals of three primary colors of red, green and blue. Background technique [0002] Chlorophyll is the material basis for photosynthesis of green plants and an important indicator for the study of plant growth, physiological metabolism and nutritional status. Determining the chlorophyll content of plant leaves can provide scientific basis for studying plant physiological characteristics, recommending nitrogen fertilizer application, tapping production potential and variety resources, etc. The determination of chlorophyll content in plant leaves mainly includes chemical analysis method, computer vision method and chlorophyll meter method. Chemical analysis is a quantitative method with high precision, but th...

Claims

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Application Information

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IPC IPC(8): G01N21/27
Inventor 何明霞张素娟李进才王璞李萌张旭
Owner TIANJIN UNIV
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