A method for correcting the attenuation of an instrument by using the relative ratio of mercury lamp spectral lines
By using the relative proportional relationship of the mercury lamp spectrum line to perform instrument attenuation correction, the problem of cumbersome and high cost of attenuation correction in orbital radiation instruments is solved, and efficient and low-cost attenuation correction effect is achieved.
Patent Information
- Application Number
- CN202411669314.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2044-11-21
AI Technical Summary
When correcting attenuation in orbital radiation instruments, the existing technology is cumbersome to operate, high cost, and it is difficult to accurately determine external conditions in orbital environments, affecting the accuracy of attenuation correction.
The instrument attenuation correction was performed using the relative proportional relationship of the mercury lamp spectrum line. By irradiating the instrument with a mercury lamp under the conditions of constant dark environment, temperature, voltage, and mercury vapor pressure, the characteristic radiation spectrum of the mercury lamp at each wavelength was obtained, and the maximum wavelength was used as the reference to obtain the relative proportion of the radiation at each wavelength, and the attenuation amount was measured as the attenuation amount of the instrument for correction.
The attenuation correction process is simplified, the cost is reduced, and the tedious steps of determining external conditions in orbital environments are avoided, efficient and low-cost attenuation is achieved, and the Fengyun-3 solar irradiance spectrometer is successfully corrected for attenuation of up to about 65%.
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Figure CN119533659B_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of calibration methods, and particularly relates to a method for calibrating the attenuation of an instrument by using the relative ratio of mercury lamp spectral lines. Background Art
[0002] When calibrating the attenuation of an on-orbit radiation instrument, a standard source can be used to calibrate the system to measure the attenuation of the instrument. However, when using a standard light source for calibration, it is usually necessary to compare the standard radiation intensity of the standard source under the external conditions at this time to determine the attenuation degree of the instrument, so as to calibrate the attenuation. However, limited by the actual conditions of the on-orbit instrument, it is not easy to know the actual situation of the external environment. Therefore, it is not easy to measure the instrument attenuation by comparing with the standard value.
[0003] Therefore, when calibrating the attenuation of an on-orbit instrument, two sets of devices with the same structure are usually set up to calibrate the attenuation of the instrument. For example, the Spectral Irradiance Monitor (SIM) carried by the Solar Radiation and Climate Experiment (SORCE) satellite is calibrated by setting up two channels, one for measuring the solar spectral irradiance and the other for calibrating the attenuation.
[0004] However, when measuring the attenuation by comparing with the standard value of the standard source, clear external conditions are required, and the comparison process is usually cumbersome. Moreover, limited by the actual observation situation, the actual external situation cannot often be directly known.
[0005] And the attenuation calibration scheme using a spare channel or a spare instrument often has a high cost. Summary of the Invention
[0006] In order to solve the problems of cumbersome operation and high cost in the prior art for calibrating the attenuation of on-orbit instruments, the present invention provides a method for calibrating the attenuation of an instrument by using the relative ratio of mercury lamp spectral lines, expands the method for calibrating attenuation, and provides more ideas for calibrating attenuation.
[0007] The technical solutions adopted by the present invention to solve the above technical problems are as follows.
[0008] The method for calibrating the attenuation of an instrument by using the relative ratio of mercury lamp spectral lines of the present invention comprises the following steps:
[0009] Step 1: Under the conditions of a dark environment and constant temperature, voltage, and mercury vapor pressure, irradiate the instrument with a mercury lamp to obtain the characteristic radiation spectrum of the mercury lamp at each wavelength.
[0010] Step 2: Taking the mercury lamp characteristic radiation spectrum at the longest wavelength as a reference, normalizing the mercury lamp characteristic radiation spectra at each wavelength to obtain the relative radiation ratios of the mercury lamp characteristic radiation spectra at each wavelength;
[0011] Step 3: Regarding the attenuation amounts of the relative radiation ratios of the mercury lamp characteristic radiation spectra at each wavelength as the attenuation amounts of the instrument, and completing the attenuation correction of the instrument.
[0012] Preferably, in Step 1, the range of the wavelength is 253 - 578 nm.
[0013] The principle of the present invention is as follows:
[0014] Under the conditions that the temperature, voltage, and mercury vapor pressure remain unchanged, there is a relative ratio relationship among the characteristic spectral lines of the mercury lamp, and the spectral irradiances measured by the instrument should always satisfy this ratio relationship. However, the attenuation of the instrument for each wavelength band is different, and the part more biased towards the ultraviolet attenuates more, which will cause this ratio relationship to change. When correcting the attenuation, since the infrared hardly attenuates and the visible band attenuates extremely little, the spectral line with the longest wavelength is used as a reference, and the change in the relative ratio of the remaining spectral lines is regarded as the change in their attenuation conditions.
[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0016] The mercury lamp is not commonly used for radiation calibration. When used for attenuation correction, it is necessary to compare with the mercury lamp standard value in the current environment to perform attenuation correction. This process requires accurately determining the current environmental state and making a delicate comparison. However, the current environmental state is not easy to determine in the on-orbit state and the comparison process is cumbersome. The method for correcting attenuation by using the relative ratio relationship of mercury lamp spectral lines in the present invention is easy to operate, does not require confirming the environmental situation, and can perform attenuation correction without comparing with the standard value, which greatly facilitates the attenuation correction process.
[0017] The method for correcting the instrument attenuation by using the relative ratio of mercury lamp spectral lines in the present invention uses the mercury lamp commonly installed in the spectral instrument, and the mercury lamp is a commonly used calibration light source for the instrument, with a much lower cost compared to the backup instrument. By using the proportional relationship of its own spectrum and the change in its proportional relationship to perform attenuation correction, it can achieve the purpose of attenuation correction with low cost and high efficiency. After testing, using this method to perform attenuation correction on the remote sensing measurement data of the FY-3 solar irradiance spectrometer, it has successfully corrected up to about 65% of the attenuation of the instrument in two and a half years, indicating that the method of the present invention can effectively correct the instrument attenuation, and the corrected data is better than the result before correction. Description of the Drawings
[0018] To more clearly illustrate the technical solutions in the specific embodiments of the present invention, the following will briefly introduce the drawings required for the specific embodiments. Obviously, the drawings in the following description are only some specific embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0019] Figure 1 It is a flow chart of the method for correcting the instrument attenuation by using the relative ratio of mercury lamp spectral lines in the present invention;
[0020] Figure 2 It shows the attenuation of each band of the instrument in the two and a half years before the attenuation correction of the existing FY-3 solar irradiance spectrometer in Example 1;
[0021] Figure 3 It shows the results obtained by correcting the FY-3 solar irradiance spectrometer by using the method for correcting the instrument attenuation by using the relative ratio of mercury lamp spectral lines in Example 1. Specific Embodiments
[0022] To further understand the present invention, the following describes the preferred implementation embodiments of the present invention. However, it should be understood that these descriptions are only for further explaining the features and advantages of the present invention, rather than limiting the claims of the present invention.
[0023] As Figure 1 shown, in the method for correcting the instrument attenuation by using the relative ratio of mercury lamp spectral lines of the present invention, first, in a dark environment and under the conditions of constant temperature, voltage, and mercury vapor pressure, the instrument is irradiated with a mercury lamp to obtain the mercury lamp characteristic radiation spectra at each wavelength; then, taking the mercury lamp characteristic radiation spectrum at the longest wavelength as the reference, the mercury lamp characteristic radiation spectra at each wavelength are normalized to obtain the relative radiation ratio of the mercury lamp characteristic radiation spectra at each wavelength; finally, the attenuation amount of the relative radiation ratio of the mercury lamp characteristic radiation spectra at each wavelength is regarded as the attenuation amount of the instrument to complete the attenuation correction of the instrument. The measurement range of the wavelength is determined according to actual needs. In this embodiment, the range of the wavelength is 253 - 578 nm, and the longest wavelength is 578 nm.
[0024] The terms used in the present invention generally have the meanings commonly understood by those of ordinary skill in the art, unless otherwise specified.
[0025] To enable those skilled in the art to better understand the technical solutions of the present invention, the following will further introduce the present invention in detail by combining examples and comparative examples.
[0026] Example 1
[0027] Taking the remote sensing measurement data of the FY-3 solar irradiance spectrometer as an example, record the attenuation of each band of the instrument in the two and a half years before its attenuation correction. The results are asFigure 2 as shown. From Figure 2 It can be seen that during the two and a half years before attenuation correction, with the passage of time, attenuation occurred to varying degrees at each wavelength, among which the short wavelengths attenuated faster and the long wavelengths attenuated slower.
[0028] Taking the solar irradiance measurement data corresponding to the mercury lamp spectral lines in the remote sensing measurement data of the Fengyun-3 solar irradiance spectrometer as an example.
[0029] The attenuation of each band of the instrument during the two and a half years after using the mercury lamp to correct attenuation is as shown in Figure 3 It can be seen that the attenuation has been well suppressed, especially in the short wavelength part; Figure 3 There is still some attenuation that has not been completely suppressed. This is because in the structure of this instrument, there are still two glass plates in front of the instrument that can be irradiated by the mercury lamp, and these two glass plates still have attenuation, while this part cannot be irradiated by the mercury lamp and cannot be corrected for attenuation. It can be seen from the results that this method has successfully corrected up to about 65% of the attenuation of the instrument during two and a half years, and the results show that the attenuation of the instrument can be effectively corrected by using this method.
[0030] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the embodiments. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.
Claims
1. A method for correcting instrument attenuation using the relative ratio of mercury lamp spectral lines, characterized in that: Here are the steps: Step 1: In a dark environment, with constant temperature, voltage, and mercury vapor pressure, use a mercury lamp to irradiate the instrument to obtain the characteristic radiation spectrum of the mercury lamp at each wavelength; Step 2: Taking the characteristic radiation spectrum of the mercury lamp at the longest wavelength as a reference, normalizing the characteristic radiation spectrum of the mercury lamp at each wavelength to obtain the relative radiation proportion of the characteristic radiation spectrum of the mercury lamp at each wavelength; Step 3: The attenuation of the relative proportion of the characteristic radiation spectrum of the mercury lamp at each wavelength is regarded as the attenuation of the instrument to complete the attenuation correction of the instrument.
2. The method for correcting instrument attenuation by using the relative ratio of mercury lamp spectral lines according to claim 1, characterized in that: In step 1, the wavelength range is 253-578nm.