Optical fiber agricultural land soil organic matter content rapid detector

Abstract

The invention discloses an optical fiber type field soil organic matter content fast detector, comprising an optical path module and a control module connected with the optical path module, wherein the optical path module comprises a photoelectric detector, an optical fiber, a probe, a near-infrared light emitting diode and a drive circuit, the optical fiber comprises a light input end, a reflected light measurement end and a soil detection end, the light input end is connected with the photoelectric detector, the reflected light measurement end is connected with the photoelectric detector, the soil detection end is connected with the probe, the control module comprises a signal amplification unit, a A / D conversion unit, a control unit, a display unit and a memory unit, the signal amplification unit is connected with the photoelectric diode and the A / D conversion unit, the control unit is connected with the A / D conversion unit, the display unit and the memory unit. The invention has the advantages that the optical fiber type field soil organic matter content fast detector avoids the natural limits such as weather, is portable, and can real-timely, quickly and accurately measure soil organic matter content and quickly store mass data.

Description

technical field [0001] The invention relates to a detection device, in particular to an instrument for detecting soil organic matter. Background technique [0002] Soil organic matter is one of the most important components of soil nutrients. Therefore, the content of soil organic matter is a key indicator for the realization of balanced fertilization and soil testing and formula fertilization. The content of soil organic matter can be reflected in the spectral reflectance. For this point, compared with laboratory chemical methods, using spectral technology to measure soil organic matter content has the advantages of fast analysis speed, simple sample preparation, and multiple components for a single spectrum. Analysis, no consumption of samples, no chemical pollution and other advantages. [0003] At present, the American ASD (Analytical Spectral Devices) company and the German Bruker company have produced a series of spectroradiometers for measuring the spectral reflectan...

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Problems solved by technology

[0003] At present, the American ASD (Analytical Spectral Devices) company and the German Bruker company have produced a series of spectroradiometers for measuring the spectral reflectance of ground objects, and these instruments include full-spectrum portable spectral analyzers (wavelength range: 350-2500nm) and Hand-held portable spectrum analyzers (wavelength range: 300-1100nm), etc., these instruments have high measurement accuracy and spectral resolution, but their dispersion elements are all made of holographic reflection gratings or Michelson interferometers, which makes the price of the instruments Expensive, and since they are general-purpose precision instruments, only suitable for research and not for production

[0004] In addition, some research institutions and universities have also developed some targeted testing instruments for measuring soil parameters, but only a small part of them can meet the requirements of real-time measurement in the field, and even this small part can be carried out on site The measuring instrument has a complex structure, large volume and weight, and is extremely unsuitable for operators to perform long-term measurements in the field.

[0005] In addition, the currently developed detection instruments based on the principle of spectroscopy basically use sunlight as the incident light to measure the reflected light reflected by the soil surface. Due to the requirements for the intensity of the incident light, the use of detection instruments will also be limited by the weather, etc. ; Moreover, there is currently no special testing instrument for soil organic matter

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