Method for evaluating compatibility of head-up display picture of military laser protective lens
阅读说明：本技术 一种军用激光防护镜片的平显画面兼容性评价方法 (Method for evaluating compatibility of head-up display picture of military laser protective lens ) 是由 王居豪 李文阳 徐剑 杨国甫 于 2021-08-31 设计创作，主要内容包括：本发明公开了一种军用激光防护镜片的平显画面兼容性评价方法,包括以下步骤：测定舱内平显显示画面的最大亮度值和频谱曲线；测定需要激光防护镜片透过率曲线；根据平显的频谱曲线和激光防护镜片透过率曲线计算激光防护镜片的平显透过系数TR-(镜片)；根据舱内平显显示画面的最大亮度值计算出在高空迎光条件人眼能看清平显所需的激光防护镜片平显透过系数TR-(指标)；将计算得到的激光防护镜片平显透过系数TR-(镜片)与人眼能看清平显所需的平显透过系数TR-(指标)进行对比,当TR-(镜片)≥TR-(指标)时,激光防护镜片可以满足平显画面的观测需求,反之则不满足。本发明可以作为量化指标制定的依据,同时极大程度减少试验成本,提高研制效率。(The invention discloses a head-up display picture compatibility evaluation method of military laser protective lenses, which comprises the following steps: measuring the maximum brightness value and the spectral curve of a display frame displayed in the cabin; determining a transmittance curve of the required laser protective lens; calculating the average light transmittance TR of the laser protective lens according to the average light spectrum curve and the transmittance curve of the laser protective lens Lens (ii) a Calculating the head-up display transmission coefficient TR of the laser protective lens required by the human eyes to see the head-up display under the high-altitude light-facing condition according to the maximum brightness value of the head-up display picture in the cabin Index (I) (ii) a The calculated laser protective lens average display transmission coefficient TR Lens The head-up display transmission coefficient TR required for the head-up display visible to human eyes Index (I) By comparison, when TR Lens ≥TR Index (I) In time, the laser protection lens can meet the observation requirement of the head-up display picture, otherwise, the laser protection lens cannot meet the observation requirement. The invention can be used as the basis for formulating the quantitative index, greatly reduces the test cost and improves the development efficiency.)
1. A method for evaluating the compatibility of a head-up display picture of a military laser protective lens is characterized by comprising the following steps:
step 1, measuring the maximum brightness value L of a display picture in a cabinHead-up displaySum frequency spectrum curve SFlat plate(λ)；
Step 2, determining a transmittance curve T (lambda) of the required laser protective lens;
step 3, according to the flat spectrum curve SFlat plate(lambda) and the transmittance curve T (lambda) of the laser protective lens to calculate the mean transmittance TR of the laser protective lensLens；
Step 4, according to the maximum brightness value L of the display picture displayed in the cabinHead-up displayCalculating the head-up display transmission coefficient TR of the laser protective lens required by the human eye to see the head-up display under the high altitude light-facing conditionIndex (I)；
Step 5, the calculated laser protective lens average transmittance TRLensThe head-up display transmission coefficient TR required for the head-up display visible to human eyesIndex (I)By comparison, when TRLens≥TRIndex (I)In time, the laser protective lens can be fullThe observation requirement of the image is sufficiently highlighted, otherwise, the observation requirement is not satisfied.
2. The method for evaluating compatibility of flat display frames for military laser protective lenses according to claim 1, wherein in the step 1, the maximum luminance value L of the flat display frame in the chamber is measured by a spectrum analyzer and a luminance meterHead-up displaySum frequency spectrum curve SFlat plate(λ)。
3. The method for evaluating the compatibility of the flat display screen of the military laser protective lens according to claim 1, wherein in the step 2, the transmittance curve T (λ) of the laser protective lens to be examined is measured by a spectrophotometer.
4. The method for evaluating the compatibility of flat display frames of military laser protective lenses according to claim 1, wherein in the step 3, the flat display transmittance TR of the laser protective lensesLens：
In the formula, SFlat plate(λ) is the averaged spectral curve; sSunlight(λ) is the spectral curve of daylight; t (lambda) is the transmittance curve of the laser protective lens.
5. The method for evaluating the compatibility of flat display screens of military laser protective lenses according to claim 1, wherein in the step 4, the maximum luminance according to high-altitude flight is 36000cd/m2The contrast ratio 1.2 required by normal observation of human eyes is combined with the maximum brightness value L of the display picture displayed in the cabinHead-up displayAnd calculating the head-up display transmission coefficient of the laser protective lens required by the human eye to see the head-up display under the high-altitude light-facing condition.
6. The method for evaluating the compatibility of flat display frames of military laser protective lenses according to claim 5, wherein in the step 4, the human eyes can see the flat display transmittance of the laser protective lenses required by the flat display under the high altitude light-facing condition
In the formula LHead-up displayThe maximum brightness value of the display picture is displayed.
Technical Field
The invention relates to the technical field of aviation equipment, in particular to a head-up display picture compatibility evaluation method of military laser protective lenses.
Background
Military laser protection lenses are used as important components of a pilot helmet, and need to be perfectly compatible with optical environments such as a display picture and an indicator light in an aircraft cabin while playing a laser protection role.
According to the visual characteristics of human eyes, in order to ensure the sensitivity and comfort of human eyes, the center wavelength of the highlighted display is usually set to 544 nm. According to the wave band range of the current laser weapons at home and abroad, the military laser protective lens needs to protect the lasers in the two wave bands, wherein the laser protection is 532nm and 1064nm respectively, and the laser protection requirement is that the 0D value is not less than 3 (the transmittance of the laser protective lens at 532nm is 0.1%). Because the protection wave band (532nm) is very close to the central wave band (544nm) of the head-up display, if the laser protection lens is manufactured in a problem, the laser protection lens can absorb most of light rays of the head-up display picture while protecting 532nm laser, so that the head-up display observation is difficult, and particularly, a pilot is difficult to see the head-up display picture under the high-altitude light-facing flight condition and high background brightness.
The existing evaluation method for the compatibility of the military laser protective lens and the head-up display picture is mainly measured through actual head-up display observation, and particularly, a pilot can reflect that the laser lens cannot clearly display at a high-altitude high-brightness condition of flying over the sun and can clearly see the head-up display at a back-to-sun and ground condition at the present stage, so that the head-up display observation is influenced, the evaluation can be only carried out on the trial flight in the last day at the present stage, the development progress is seriously influenced, and the development cost is increased.
Disclosure of Invention
The invention aims to solve the technical problem that aiming at the defects in the prior art, the invention provides the method for evaluating the compatibility of the head-up display picture of the military laser protective lens, which can be used as a basis for formulating quantitative indexes, greatly reduces the test cost and improves the development efficiency.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a head-up display picture compatibility evaluation method for military laser protective lenses comprises the following steps:
step 1, measuring the maximum brightness of a display picture in a cabinValue LHead-up displaySum frequency spectrum curve SFlat plate(λ)；
Step 2, determining a transmittance curve T (lambda) of the laser protective lens to be examined;
step 3, according to the flat spectrum curve SFlat plate(lambda) and the transmittance curve T (lambda) of the laser protective lens to calculate the mean transmittance TR of the laser protective lensLens；
Step 4, according to the maximum brightness value L of the display picture displayed in the cabinHead-up displayCalculating the head-up display transmission coefficient TR of the laser protective lens required by the human eye to see the head-up display under the high altitude light-facing conditionIndex (I)；
Step 5, the calculated laser protective lens average transmittance TRLensThe head-up display transmission coefficient TR required for the head-up display visible to human eyesIndex (I)By comparison, when TRLens≥TRIndex (I)In time, the laser protection lens can meet the observation requirement of the head-up display picture, otherwise, the laser protection lens cannot meet the observation requirement.
According to the technical scheme, in the step 1, the maximum brightness value L of the display screen in the cabin is measured through the spectrum analyzer and the brightness meterHead-up displaySum frequency spectrum curve SFlat plate(λ)。
According to the technical scheme, in the step 2, the transmittance curve T (lambda) of the laser protective lens to be examined is measured by a spectrophotometer.
According to the technical scheme, in the step 3, the apparent transmittance TR of the laser protective lens isLens，TRLensThe definition of (2) is the ratio of the relative average transmittance of the laser protective lens in the visible light range to the relative sunlight transmittance of the laser protective lens, and the calculation formula is as follows:
in the formula, SFlat plate(lambda) is a flat spectrum curve, which is actually measured by a spectrum analyzer; sSunlight(lambda) is a spectrum curve of sunlight and can be obtained by table lookup; t (lambda) is laserAnd the transmittance curve of the protective lens is obtained by measuring with a spectrophotometer.
According to the technical scheme, in the step 4, the maximum luminance is 36000cd/m according to high-altitude flight2The contrast ratio 1.2 required by normal observation of human eyes is combined with the maximum brightness value L of the display picture displayed in the cabinHead-up displayAnd calculating the head-up display transmission coefficient of the laser protective lens required by the human eye to see the head-up display under the high-altitude light-facing condition.
According to the technical scheme, in the step 4, the human eyes can see the highlight transmission coefficient of the laser protective lens required by the highlight under the high-altitude light-facing condition
In the formula LHead-up displayThe maximum brightness value of the displayed picture is actually measured by a brightness meter.
The invention has the following beneficial effects:
according to the method, after the optical indexes related to the head up display are measured in advance, the head up display transmission coefficient is used as the index of the laser lens, the optical compatibility evaluation of the laser protective lens and a head up display picture can be quantitatively checked only by calculating the head up display transmission coefficient, the optical compatibility evaluation can be used as the basis for formulating the quantitative index, the test cost is greatly reduced, and the development efficiency is improved.
Drawings
FIG. 1 is a graph of a spectrum of a flat display screen according to an embodiment of the present invention;
FIG. 2 is a graph of transmittance of an exemplary laser protective lens in accordance with an embodiment of the present invention;
fig. 3 is a graph of the frequency spectrum of sunlight in an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Referring to fig. 1 to 3, in an embodiment of the invention, a method for evaluating the compatibility of a flat display screen of a military laser protective lens includes the following steps:
step 1, measuring the maximum brightness value L of a display picture in a cabinHead-up displaySum frequency spectrum curve SFlat plate(λ)；
Step 2, determining a transmittance curve T (lambda) of the required laser protective lens;
step 3, according to the flat spectrum curve SFlat plate(lambda) and the transmittance curve T (lambda) of the laser protective lens to calculate the mean transmittance TR of the laser protective lensLens；
Step 4, according to the maximum brightness value L of the display picture displayed in the cabinHead-up displayCalculating the head-up display transmission coefficient TR of the laser protective lens required by the human eye to see the head-up display under the high altitude light-facing conditionIndex (I)；
Step 5, the calculated laser protective lens average transmittance TRLensThe head-up display transmission coefficient TR required for the head-up display visible to human eyesIndex (I)By comparison, when TRLens≥TRIndex (I)In time, the laser protection lens can meet the observation requirement of the head-up display picture, otherwise, the laser protection lens cannot meet the observation requirement.
Further, in the above step 1, the maximum luminance value L of the in-cabin display screen is measured by the spectrum analyzer and the luminance meterHead-up displaySum frequency spectrum curve SFlat plate(λ)。
Further, in the step 2, the transmittance curve T (λ) of the laser protection lens to be examined is measured by a spectrophotometer.
Further, in the step 3, the apparent transmittance TR of the laser protection lensLens：
In the formula, SFlat plate(λ) is the averaged spectral curve; sSunlight(λ) is the spectral curve of daylight; t (lambda) is the transmittance curve of the laser protective lens.
Further, in the step 4, the maximum luminance according to the high-altitude flight is 36000cd/m2Contrast with that required by normal observation of human eyesRate 1.2 in combination with maximum luminance value L of the in-cabin display frameHead-up displayAnd calculating the head-up display transmission coefficient of the laser protective lens required by the human eye to see the head-up display under the high-altitude light-facing condition.
Further, in the step 4, the human eyes can see the highlight transmission coefficient of the laser protection lens required by the highlight under the high-altitude light-facing condition
In the formula LHead-up displayThe maximum brightness value of the display picture is displayed.
In an embodiment of the present invention, taking the tie performance of a certain type of airplane as an example, whether a certain type of laser protection lens meets the tie observation requirement is calculated as an example for explanation:
first, the spectral distribution of the on-screen display was measured by a spectrum analyzer, and the spectral distribution was represented as S in FIG. 1Flat plate(λ), the test results are shown in table 1.
TABLE 1 spectral distribution of certain types of visualizations
Wave band (nm)
Spectral values
532
27.93764
534
32.19672
536
60.77858
538
143.4885
540
171.7374
542
183.3666
544
187.459
546
183.1203
548
175.1271
550
160.4268
552
133.7159
554
83.94143
556
31.58072
Measuring the maximum display luminance L of the in-cabin display screen using a luminance meterHead-up displayAnd found to be 8900cd/m2。
The transmittance curve T (λ) of a certain type of laser protection lens was then measured using a spectrophotometer, and the results are shown in fig. 2.
Calculating to obtain the average transmission coefficient of a certain type of laser protective lens:
calculating to obtain the average transmittance index required by the average display:
comparative derived TRLens＜TRIndex (I)Then, the laser protection lens cannot meet the observation requirement of the type of head-up display, and the risk that the head-up display cannot be seen clearly under the high-altitude light-facing condition exists.
The above is only a preferred embodiment of the present invention, and certainly, the scope of the present invention should not be limited thereby, and therefore, the present invention is not limited by the scope of the claims.
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