Spectral equipment radiation calibration device

Abstract

The utility model provides a spectrum equipment radiation calibration device, which comprises a standard light source, a first spectrograph (for measuring the DN value of a ground object) and a second spectrograph (for measuring the DN value of the sun), the standard light source is provided with two light outlets, the direct light outlets are connected with a cosine corrector or a reflectivity calibration white board, and the cosine corrector is connected with the second spectrograph through an optical fiber; the side light outlet is sequentially connected with a spectral lens and a first spectrograph, and the spectral lens is connected with the first spectrograph through an optical fiber. According to the utility model, the interference of external environmental factors in the equipment calibration process is reduced, the precision of a spectrum instrument is improved, and the equipment stability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of spectroscopy, in particular to a radiation calibration device for a spectroscopic device. Background Art

[0002] With the in-depth development of spectroscopy theory and the improvement of process preparation conditions, the development of spectrometers has also made great progress. In 1859, Kirchhoff and Bunsen prepared the first structurally complete spectroscopic analysis instrument, and for the first time completed the analysis of spectral components, marking the birth of spectroscopic instruments. Since then, spectrometers have gradually developed from prism spectroscopy to grating spectroscopy, improving the accuracy and stability of spectral measurements.

[0003] The system structure of modern spectrometers mainly includes a light source module, an optical path collimation module, an optical dispersion module, an optical path focusing module, an optical signal acquisition module, and a spectral data collection and transmission module. Among them, the light source module is the light signal source of the spectrometer. For an instrument studying the absorption spectrum of substances, the stability of the light source is particularly important. The spectrometer decomposes the polychromatic light into monochromatic lights of different wavelengths through a series of optical modules, and converts these optical signals into electrical signals through the optical signal acquisition module for further processing.

[0004] The irradiance calibration equipment of the spectrometer calibration device converts the measured DN value of the spectrometer by using a standard light source or a standard sample with known irradiance, so as to obtain the calibration coefficient of the spectrometer, and finally calculates the standard irradiance value. Its function is that the spectrometer usually outputs a DN value, and the DN value is a dimensionless value, usually related to the system dark noise. Therefore, even when measuring the same object at the same position, the DN values obtained by two spectrometers are not the same. In order to ensure the accuracy and reliability of the results obtained during the use of the spectrometer, calibrating the spectrometer DN value to irradiance is an important part of spectroscopy technology and is widely used in many fields such as materials science, environmental monitoring, biomedicine, food science, and the pharmaceutical industry. One application of the spectrometer is to calculate the reflectivity of the spectroscopic instrument by measuring the reflected light irradiance of the spectroscopic instrument at different wavelengths. Through the integrated assembly of equipment components, the interference brought by external factors is reduced, the accuracy and stability of spectrometer calibration are improved, and the accuracy and accuracy of the spectrometer calibrated by the spectrometer reflectivity calibration device are greatly improved, shortening the measurement time of the spectrometer, reducing repeated measurements due to insufficient accuracy, and improving the measurement efficiency, providing strong support for the research, production, and development of related applications using the spectrometer. Summary of the Utility Model

[0005] In order to improve the accuracy and stability of spectroscopic instruments, the utility model provides a radiation calibration device for a spectroscopic device, which reduces the interference of external environmental factors during the equipment calibration process through integrated accessories, improves the accuracy of spectroscopic instruments, and improves the stability of the equipment.

[0006] The radiation calibration device for a spectral device provided by the present utility model includes a standard light source, a first spectrometer, and a second spectrometer. Among them,

[0007] The standard light source has two light output ports. Among them, the direct light output port is connected to a cosine corrector or a reflectance calibration whiteboard, and the cosine corrector is connected to the second spectrometer through a second optical fiber; the side light output port is sequentially connected to a spectral lens, a first optical fiber, and the first spectrometer.

[0008] Furthermore, it further includes a light-shielding outer cover for covering and shielding interference from external light sources.

[0009] Furthermore, it further includes a constant current power supply controller for outputting a constant current to the standard light source.

[0010] Furthermore, the panel of the constant current power supply controller has buttons for controlling the switch of the standard power supply.

[0011] Furthermore, the constant current power supply controller is connected to the standard light source through a aviation plug connector on the light-shielding outer cover.

[0012] Furthermore, a data interface capable of being detachably connected to the spectrometer is provided on the light-shielding outer cover for communicating with a PC terminal.

[0013] Furthermore, the light-shielding outer cover is made of aluminum alloy material, and the whole shell is sprayed with a black paint surface.

[0014] Furthermore, the spectrometer converts the collected spectral energy signal into an electrical signal, transmits it to the PC terminal device through the data interface, the PC terminal calculates the DN value conversion irradiance coefficient, and then writes it into the spectrometer.

[0015] The beneficial effects of the present utility model include:

[0016] (1) By this method, the two spectrometers can directly perform dimensional irradiance measurements while ignoring the differences in the dark spectra and calibrations of the two instruments themselves, and then measure the reflectance of an object, obtaining a more accurate object reflectance value, laying a solid foundation for more accurate inversion or analysis in the next step.

[0017] (2) This device can calibrate two spectrometers at one time, making the factory calibration faster and more accurate. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the radiation calibration device for a spectral device according to an embodiment of the present utility model. Detailed Embodiment

[0019] The following will describe the present utility model in detail with reference to the drawings.

[0020] The radiation calibration device for a spectral device provided by the present utility model, asFigure 1 As shown, it includes a constant current power supply controller 1, a light-shielding outer cover 2, and a standard light source 4.

[0021] The constant current power supply controller 1 is connected to a 220V power supply and is connected to the aviation plug connector 3 on the light-shielding outer cover 2 through a cable, and is used to output a constant current to the standard light source 4. There is a button on the panel of the constant current power supply controller 1 for controlling the turning on of the standard power supply 4.

[0022] In one embodiment, the light-shielding outer cover 2 is made of aluminum alloy, and the whole shell is sprayed with a black paint surface.

[0023] The light-shielding outer cover 2 is a hollow shell, which covers instruments such as the standard light source 4 and the spectrometer during the equipment calibration process to shield the interference of external light sources during the equipment calibration process. The aviation plug connector 3 is connected to the standard light source 4 through a cable.

[0024] The standard light source 4 is used to maintain a consistent lighting effect for a long time and provide stable spectral energy. For example, it is a model SL1-CAL halogen lamp, the spectral use range meets the requirements, it has a long service life, and has excellent stability. The standard light source 4 has 2 light output ports. Among them, the direct light output port 5 is connected to a cosine corrector or a reflectance calibration whiteboard; the cosine corrector is connected to a second spectrometer 9 through a second optical fiber for receiving sunlight, and the second spectrometer 9 converts the optical signal into an electrical signal, which contains the DN value. The side light output port 6 is sequentially connected to a spectral lens, a first optical fiber, and a first spectrometer 8. The spectral lens, the first optical fiber, and the first spectrometer are used to receive reflected light, and the first spectrometer 8 converts the optical signal into an electrical signal, which contains the DN value of the reflected light. The spectrometers 8 and 9 transmit the electrical signal to the PC through the data interface 7, or receive instructions from the PC, such as writing a DN conversion coefficient instruction.

[0025] The spectral device radiation calibration device is used in a dark room, and the button on the panel of the constant current power supply controller 1 controls the switch of the standard light source 4.

[0026] The data interface 7 on the outer cover of the light-shielding outer cover 2 provides a data power supply interface. During the equipment calibration process, all the equipment to be calibrated, that is, the first spectrometer 8 and the second spectrometer 9, are placed on a flat working platform desktop. The light-shielding outer cover 2 covers the equipment to be calibrated, so that the equipment can maintain a closed state, and the outer cover color is black. Black has good light-shielding performance, so that the inside of the light-shielding outer cover can shield external light sources to the greatest extent.

[0027] The turning on of the standard light source 4 is controlled by a button on the panel of the constant current power supply controller 1, providing stable spectral energy for the spectrometer to be calibrated. A reflectivity calibration whiteboard is placed at the direct light outlet 5, and a spectral lens is placed at the side light outlet 6. By operating the constant current power supply controller 1 to turn on the standard light source 4, the light irradiates the reflectivity calibration whiteboard, and the reflected light irradiates the side light outlet 6, which is received by the spectral lens and then collected by the first spectrometer 8. The first spectrometer converts the collected optical signal into an electrical signal (including the DN value of the reflected light). The PC terminal reads and processes the DN value collected by the first spectrometer 8 through the data interface 7, completes the calculation of the coefficient of converting DN value to irradiance for this set of devices, and then writes the coefficient of converting DN value to irradiance into the first spectrometer 8 to complete the calibration of this set of devices including the spectral lens, the first optical fiber, and the first spectrometer 8. Then, replace the reflectivity calibration whiteboard placed at the direct light outlet 5 with a cosine corrector, and keep the spectral lens placed at the side light outlet 6 unchanged. After the standard light source 4 is turned on, the light irradiates the cosine corrector and is then collected by the second spectrometer 9 connected to the cosine corrector. The second spectrometer 9 converts the collected optical signal into an electrical signal (including the DN value of sunlight). Similarly, the PC terminal reads and processes the DN value collected by the second spectrometer 9 through the data interface 7, calculates the coefficient of converting DN value to irradiance for this set of devices, and then writes the coefficient of converting DN value to irradiance into the second spectrometer 9 to complete the calibration of this set of devices including the cosine corrector, the second optical fiber, and the second spectrometer 9.

[0028] That is to say, the spectrometer converts the collected spectral energy signal into an electrical signal, which is transmitted to the PC terminal device through the data interface 7. The PC terminal processes the spectral acquisition data through software, obtains the coefficient of converting DN value to irradiance of the spectrometer, and then writes this coefficient into the spectrometer to complete the calibration.

[0029] The two spectrometers are devices to be calibrated with the same parameters. After calibration, they are used to measure different objects: the spectral lens, the first optical fiber, and the first spectrometer 8 are used to measure the irradiance of ground objects; the cosine corrector, the second optical fiber, and the second spectrometer 9 are used to measure the solar irradiance towards the sky. They need to be calibrated separately, with different standards and calibration methods. One is to directly calibrate through the direct light outlet 5; the other is to replace the direct light outlet 5 with a whiteboard and perform calibration at the side light outlet 6.

[0030] Those of ordinary skill in the art can understand that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope defined by the claims of the present invention.

Claims

1. A radiation calibration device for a spectral device, characterized in that, It includes a standard light source, a first spectrometer, and a second spectrometer. Among them, The direct light output port of the standard light source is connected to a cosine corrector or a reflectance calibration whiteboard. The cosine corrector is connected to the second spectrometer through a second optical fiber; the side light output port of the standard light source is sequentially connected to a spectral lens, a first optical fiber, and the first spectrometer.

2. The spectral device radiation calibration device according to claim 1, wherein It also includes a light-shielding outer cover for covering and shielding the interference of external light sources.

3. The spectral device radiation calibration device according to claim 1, characterized in that, It also includes a constant current power controller for outputting a constant current to the standard light source.

4. The spectral device radiation calibration device according to claim 2, wherein, There are buttons on the panel of the constant current power controller for controlling the switch of the standard power supply.

5. The spectral device radiation calibration device according to claim 4, wherein The constant current power controller is connected to the standard light source through a aviation plug connector on the light-shielding outer cover.

6. The spectral device radiation calibration device according to claim 2, characterized in that, A data interface that can be detachably connected to the spectrometer is provided on the light-shielding outer cover for communicating with the PC side.

7. The spectral device radiation calibration device according to claim 2, characterized in that The light-shielding outer cover is made of aluminum alloy, and the whole shell is sprayed with a black paint finish.

8. The spectral device radiation calibration device according to claim 1, wherein, The spectrometer converts the collected spectral energy signal into an electrical signal, transmits it to the PC-side device through the data interface, and the PC side calculates the DN value conversion irradiance coefficient and then writes it into the spectrometer.

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