CN201788146U - Pulse Xenon Arc Soil Nutrient Tester - Google Patents

Abstract

The utility model provides a pulsed xenon lamp type soil nutrient tester. The pulsed xenon lamp type soil nutrient tester is characterized in that a pulsed xenon lamp capable of emitting 200-760mm continuous spectrum is adopted as an ultraviolet and visual light source, a diffracting grating computer-tomography (C-T) monochromator is used as a light splitter component to realize light splitting after synchronization, a 1024-pixie photodiode array (PDA) is used as a detector so that full-waveband spectrum scanning can be realized without rotating a grating, and a 16-bit STM32 single chip microcomputer based on an ARMCortex-M3 embedding system is used for signal processing. The pulsed xenon lamp type soil nutrient tester not only has the fundamental functions of a conventional ultraviolet and visual light spectrophotometer for a lab, but also has additional functions of portability, shock resistance, speediness, economical property, practicality and the like, and can accurately, speedily and highly effectively test nonmetal elements such as nitrogen (N), phosphorus (P), sulphur (S), boron (B) and the like in soil nutrient.

Description

Pulse Xenon Arc Soil Nutrient Tester

technical field

The utility model belongs to the field of soil nutrient detection, in particular to a pulse xenon lamp type soil nutrient tester.

Background technique

Soil nutrient parameters are important soil fertility indicators, which reflect the ability of soil to supply crop growth. In recent years, my country has vigorously promoted the technology of soil testing and formula fertilization to promote the improvement of fertilizer utilization rate and effectively reduce the environmental pollution caused by excessive fertilization. Soil nutrient testing is the basis of soil testing and formula fertilization, and accurate and rapid measurement of soil nutrients is the basis of precision fertilization. There are many ways to detect soil nutrients. In general, metal trace elements in soil can be measured by atomic absorption spectrophotometer; for non-metallic elements in soil, the common method is to use ultraviolet spectrophotometer or photoelectric colorimeter Conduct; measure pH and conductivity in soil, etc. by electrochemical sensors. For some macroelements in soil, there are also reports of testing by near-infrared methods.

Commonly used UV-visible spectrophotometers for the testing of non-metallic elements in soil nutrients usually use a single-beam or double-beam light source, a single-channel photomultiplier tube to achieve photoelectric conversion, and usually use a wavelength scanning mechanism (grating or sinusoidal mechanism) to realize the wavelength of the entire spectral range. scanning. Therefore, this type of instrument is bulky, slow in measurement speed, cannot be measured online, and requires fixed placement without any vibration conditions, so it can only be used in the laboratory, which limits its application and promotion in agricultural and industrial sites . In recent years, with the development of photoelectric technology, computer technology, CCD detector and other technologies, there are more and more business demands for miniaturization and portability of such spectrophotometers for direct field application.

Utility model content

The utility model provides a pulse xenon lamp type soil nutrient tester aiming at the problems of large equipment volume and harsh test conditions in the prior art. It is characterized in that the sample module is located between the light source module and the light splitting module, the light splitting module is connected to the detection module, the detection module is connected to the signal processing module, and the signal processing module is connected to the display module;

The power module is connected to the light source module;

The control module is respectively connected with the power supply module, the light source module and the signal processing module.

The light source module is a pulsed xenon lamp emitting a continuous spectrum of 200-760nm.

The spectroscopic grating is a C-T monochromator with a wavelength range of 190-1000nm.

The detector is a photodiode array detector with 1024 pixels.

The signal processing in the CPU and the communication control interface module adopts 16 STM32 single-chip microcomputers based on the ARM Cortex-M3 embedded system.

The sample module adopts a quartz sample cell.

The utility model not only realizes high-precision light splitting, but also scans the entire spectrum at one time. The light source not only has a long life, but also can be started at any time during scanning without preheating. Therefore, the pulse xenon lamp soil nutrient tester of the present invention not only has the basic functions of a conventional laboratory ultraviolet-visible spectrophotometer, but also has additional functions such as portability, shock resistance, fastness, economy, and practicality, and can accurately and quickly test soil nutrients. Efficient testing of non-metallic elements in nutrients.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is described in detail:

Figure 1 shows the structure of the pulse xenon lamp soil nutrient tester.

Detailed ways

As shown in Figure 1, the pulsed xenon lamp soil nutrient tester is composed of a power supply module, a light source module, a sample module, a spectroscopic module, a signal processing module, a control module, and a display module.

The power module is composed of 220V AC power supply and 12V lithium-ion battery, which is responsible for using AC or battery to supply power to various components of the instrument.

The light source module is composed of a pulsed xenon lamp, which can emit a continuous spectrum of 200-760nm and irradiate the sample module.

The sample module uses quartz sample cuvettes to reduce the loss of UV light.

The spectroscopic module splits the compound light passing through the sample module, and adopts the diffraction grating C-T monochromator as the spectrometer component to realize synchronous splitting without affecting the resolution.

The detection module uses a 1024-pixel photodiode array PDA as a detector to convert the optical signal after the grating split into an electrical signal, and realize full-band spectral scanning without rotating the grating.

The electrical signal passed through the detection module is transmitted to the signal processing module, and the processed data is displayed through the display module.

The control module uses a 16-bit STM32 single-chip microcomputer based on ARM Cortex-M3 embedded system and its I/O interface to control the power supply and light source on and off, and analyze and process various raw information collected by the detection module.

The display module adopts a 2.8-inch 320×240 true-color touch screen.

Claims (4)

1. Pulse xenon lamp type soil nutrient tester, it is characterized in that, described sample module is positioned between light source module and spectroscopic module, and described spectroscopic module is connected with detection module, and described detection module is connected with signal processing module, and described signal processing module The module is connected with the display module; The power module is connected to the light source module; The control module is respectively connected with the power supply module, the light source module and the signal processing module. 2. The tester according to claim 1, wherein the light source module is a pulsed xenon lamp. 3. The tester according to claim 1, wherein the light splitting module is a C-T monochromator. 4. The tester according to claim 1, wherein the detection module is a photodiode array detector with 1024 pixels.

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