Spectral calibration method for crop nitrogen sensor

A spectral calibration and sensor technology, applied in the field of crop spectral calibration, can solve the problems of rare homogeneity ground objects, high price of hyperspectral ground object instruments, etc., to improve the measurement stability and accuracy, and improve the measurement accuracy and stability. Sexual and inhibitory effects

Active Publication Date: 2015-12-16
NANJING AGRICULTURAL UNIVERSITY
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Problems solved by technology

Method 1 requires a large enough standard gray scale to meet the calibration field of view of the sensor. Method 2 is more flexible to use, but hyperspectral ground objects are expensive, and uniform ground objects are relatively rare in practice.

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  • Spectral calibration method for crop nitrogen sensor
  • Spectral calibration method for crop nitrogen sensor
  • Spectral calibration method for crop nitrogen sensor

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with accompanying drawing:

[0033] Such as Figures 1 to 9 , a crop nitrogen sensor spectral calibration method, comprising the following steps:

[0034] 1) Use the standard detector to calibrate the irradiance of the uplink photosensor and calibrate the radiance of the downlink photosensor; that is, use the uplink photosensor and the standard detector to measure the sunlight r-band irradiance synchronously, and fit the output of the uplink photosensor DN_Up (r) and standard detector output E B The linear relationship between (r) realizes the optical radiation illuminance calibration of the uplink optical sensor, as shown in formula (3);

[0035] EB(r)=Gain_Up(r)×DN_Up(r)+Bias_Up(r)(3)

[0036] 2) Use the downlink optical sensor and the standard detector to measure the r-band radiance of the uniform diffuse reflector synchronously, and fit the downlink optical sensor output DN_Down(r) with the stan...

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Abstract

The invention provides a spectral calibration method for a crop nitrogen sensor. The method is characterized by comprising the following steps: 1) respectively calibrating the irradiance of an up light sensor and the radiance of a down light sensor by using a standard detector, i.e., in virtue of the up light sensor and the standard detector, synchronously measuring the irradiance of the waveband r of sun light and fitting a linear relation between the output DN_Up(r) of the up light sensor and the output EB(r) of the standard detector so as to realize calibration of the optical radiance of the up light sensor as shown in a formula (3) which is described in the specification; etc. The up light sensor is in good linear relation with the irradiance of sun light, the down light sensor is in good linear relation with the radiance, and linear relativity reaches 99%. The calibration method based on radiation can greatly improve measurement precision and stability of the crop nitrogen sensor compared with a calibration method based on a standard gray scale plate.

Description

technical field [0001] The invention relates to the technical field of crop spectrum calibration, in particular to a crop nitrogen sensor spectrum calibration method. Background technique [0002] Nitrogen is an important element that affects crop growth, yield and quality. Rapid and accurate detection and scientific and reasonable diagnosis and regulation of nitrogen levels during crop growth are the most important technical links in crop production management. The traditional method of detecting crop nitrogen levels relies on destructive sampling of plants and indoor physical and chemical analysis, which is time-consuming, laborious and time-sensitive. In recent years, non-destructive testing technology based on reflection spectrum to identify object features has been widely used in the research of crop nitrogen monitoring and yield estimation agronomic mechanism due to its advantages of non-destructiveness, convenient information acquisition, and good real-time performan...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25
Inventor 倪军曹卫星朱艳董继飞庞方荣
Owner NANJING AGRICULTURAL UNIVERSITY
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