CN202188903U - Luminosity and night vision radiation intensity tester based on beam split spectrum - Google Patents

Abstract

The utility model provides a luminosity and night vision radiation intensity tester based on beam split spectrum, which is accurate in test results and sequentially comprises an optical fiber, a spectrograph, a charge coupled device (CCD) photoelectric sensor, an analog to digital (A/D) converter and a computer according to a light path. A cosine corrector and a precise diaphragm are arranged at an incidence end of the optical fiber. The luminosity and night vision radiation intensity tester can accurately test the light intensity of light-emitting diode (LED) light sources and other light sources, luminance value of A-type and B-type night vision imaging system (NVIS) radiation strong spectrum of outer lighting lamps and night vision radiation intensity value (NR) of the outer lighting lamps. The unique light-operated synchronous trigger technology can further achieve the test of luminosity and night vision irradiation intensity (NRI) of twinkling light sources like anti-collision lamps, and the testing results are accurate and reliable.

Description

Based on spectrophotometric spectra luminosity, night vision radiation intensity tester

Technical field

The utility model relates to a kind of luminosity, night vision radiation intensity tester, particularly relates to a kind of based on spectrophotometric spectra luminosity, night vision radiation intensity tester.

Background technology

Traditional luminosity measurement is after adding the correction of V (λ) light filter through photoelectric sensor; The relative spectral response degree of photoelectric sensor is close or consistent with the human eye luminosity function, luminosity measurement requires the relative spectral response degree function curve of photoelectric sensor of instrument as shown in Figure 1.It is consistent that the relative spectral response degree of revising the back sensor and human eye luminosity function overlap fully, in theory can, be practically impossible.Can only reach international and the standard of country and the error of relevant vertification regulation regulation, after at present international and domestic general standard sources scaling method demarcation, the shading value that is used to measure traditional light source is complete feasible.But along with the application of LED lighting source, what make with such photoelectric sensor all is qualified two or three instruments when removing to measure same LED lighting source through demarcating, and often can occur reaching 30% or bigger error.This is because in V (λ) the light filter coupling, always can not be in full accord in the different wavelengths district, and the radiation spectrum of LED has strong spectral selectivity, thus cause so big test error.

Aircraft night viewing compatible lighting is for the pilot key equipment that utilizes low-light level night vision device to carry out night flying to be provided; The big young pathbreaker of its key technical index radiation intensity value be directly connected to the pilot night Night Vision Imaging System (can Night vision image system observe safely in NVIS) and normal flight.The relative spectral response degree function of night vision radiation category-A of stipulating in the world and the national military standard and category-B is respectively like Fig. 2, shown in Figure 3.The method that the traditional measurement instrument uses is at first to select for use a kind of silicon photodetector to measure its relative spectral response degree family curve, and the spectral responsivity curve of general silicon photodetector is as shown in Figure 4.Relative spectral response degree distribution curve according to silicon photodetector is prepared optical filter respectively; Make the spectral distribution of its relative spectral response degree distribution and Fig. 1, Fig. 2 and standard luminosity, category-A and category-B NVIS shown in Figure 3 consistent, thereby realize the test of the radiation intensity of luminosity, category-A NVIS, category-B NVIS.The advantage of this method is that the instrumentation that designs and produces like this is simple; Cost is lower; And its maximum shortcoming is; No matter after the optical filter that adopts what kind of technical design processing and the silicon photodetector combination, its relative spectral response degree distributes with standard V (λ), category-A NVIS, category-B NVIS spectral distribution is in full accord is impossible, and the matching error of present best V (λ) optical filter of doing in the world is also about 2%.

The utility model content

The utility model technical matters to be solved provides a kind of accurate test result luminosity, night vision radiation intensity tester.

The technical scheme that the utility model technical solution problem is adopted is: based on spectrophotometric spectra luminosity, night vision radiation intensity tester; It is characterized in that: comprise optical fiber, spectrometer, CCD photoelectric sensor, A/D converter and computing machine successively by light path, be provided with cosine corrector and precise light hurdle in the incident termination of said optical fiber.

Further, in said spectrometer, be provided with light-operated synchronizer trigger.

Further, the spectral range of said CCD photoelectric sensor is 380nm-930nm.

The beneficial effect of the utility model is: the night vision radiation of category-A and category-B NVIS radiation strong spectral radiance value and aircraft exterior lighting light fixture that the utility model can accurately be tested light intensity value, the aircraft exterior lighting light fixture of led light source and other light source is worth the test of NR by force; Unique light-operated synchronous triggering technology also can realize the luminosity of flasher such as anticollision beacon, the test of night vision radiation intensity NRI, and test result accurately and reliably.

Description of drawings

Fig. 1 is human eye luminosity function V (λ) spectral responsivity distribution coefficient curve map.

Fig. 2 is the spectral responsivity distribution coefficient curve map of category-A NIVS.

Fig. 3 is the spectral responsivity distribution coefficient curve map of category-B NIVS.

Fig. 4 is the relative spectral response degree scatter chart of silicon photodetector.

Fig. 5 is the structured flowchart of the utility model.

Fig. 6 is instrument luminosity match V (λ) the calibration curve figure of the utility model.

Fig. 7 is the instrument category-A NVIS spectral radiance match calibration curve figure of the utility model.

Fig. 8 is the instrument category-B NVIS spectral radiance match calibration curve figure of the utility model.

Embodiment

The definition and the principle of photometric measurement are:

For photometric measurement, when using the photo-detector measurement light source of band V (λ) light filter, the output photocurrent of detector is:

$I\left(A\right)={\∫}_{380}^{780}\mathrm{\Φe}\left(\mathrm{\λ}\right)S\left(\mathrm{\λ}\right)\mathrm{d\λ}---\left(1\right)$

In the formula: Φ e (λ) is the spectral power distribution of light source; S (λ) is the spectral responsivity of detector, and it can be expressed as:

S(λ)(A/W)＝S(555)Sn(λ) (2)

In the formula: S (555) is the absolute spectral response degree value of the S (λ) at the 555nm place (A/W), it is emphasized that Sn (λ) here similar in appearance to V (λ), and the both is the function with respect to peak value 555nm, and so, the luminous flux responsiveness of photo-detector can be expressed as:

$\mathrm{Sv}(A/\mathrm{lm})=\frac{I}{\mathrm{\Φv}}=\frac{S\left(555\right){\∫}_{380}^{780}\mathrm{\Φe}\left(\mathrm{\λ}\right)\mathrm{Sn}\left(\mathrm{\λ}\right)\mathrm{d\λ}}{\mathrm{Km}{\∫}_{380}^{780}\mathrm{\Φe}\left(\mathrm{\λ}\right)V\left(\mathrm{\λ}\right)\mathrm{d\λ}}---\left(3\right)$

Photo-detector for band V (λ) light filter equals V (λ) like Sn (λ), and the distribute power of luminous flux responsiveness and light is irrelevant.Be actually and can not do not equate, the coupling modifying factor of Φ e (λ) is to go out with computes:

$F=\frac{{\∫}_{380}^{780}\mathrm{\Φe}\left(\mathrm{\λ}\right)\·V\left(\mathrm{\λ}\right)\mathrm{d\λ}}{{\∫}_{380}^{780}\mathrm{Sn}\left(\mathrm{\λ}\right)\·V\left(\mathrm{\λ}\right)\mathrm{d\λ}}---\left(4\right)$

General Sn (λ) is approaching more with V (λ), and F is more near 1.

And the method for the utility model is a spectral power at light source is under the condition of Φ e (λ); The relative spectral response degree of accurately measuring detector through incorporate testing tool distributes, and the method that accurately spectral responsivity of instrument is distributed through numeral then fits to V (λ) function in full accord.

According to the photometry principle, during with the luminous flux of this apparatus measures light source, the relation between its output photocurrent and the luminous flux (lm) is:

$\mathrm{\Φv}\left(\mathrm{lm}\right)=\frac{\mathrm{Km}\·F\·I}{S\left(555\right)}---\left(5\right)$

In the formula: F=1

Relation between the effective stop area A that measuring light illumination and instrument use is:

$\mathrm{Ev}\left(\mathrm{lx}\right)=\frac{\mathrm{Km}\·I}{S\left(555\right)A}---\left(6\right)$

Light intensity was when measuring distance was the pointolite of γ:

$\mathrm{Iv}\left(\mathrm{cd}\right)=\frac{\mathrm{Km}\·I\·{\mathrm{\γ}}^2}{S\left(555\right)A}---\left(7\right)$

Can know by above description, during with the luminosity value of the apparatus measures light source of the utility model, not have the matching error problem of V (λ), thereby can realize the accurate test of the luminosity value of different spectral power distribution (like LED) light source.

The definition of NVIS radiation intensity is: the integration of the spectral radiance of the outer light source of machine and the spectral responsivity value of night vision goggles.This integrated value is NVIS radiation intensity NRI.NVIS spectral radiance and the incorporate method of night vision goggles spectral responsivity distribution curve are similar to the light intensity in the above-mentioned photometry, follow inverse square law equally for pointolite.

$\mathrm{NRI}=G{\left(\mathrm{\λ}\right)}_{\max }{\∫}_{450}^{930}G\left(\mathrm{\λ}\right)\·S\·N\left(\mathrm{\λ}\right)\mathrm{d\λ}$

In the formula: G (λ) _Max=lmA/W

The relative spectral response degree of G (λ)=relative category-A of night vision goggles or category-B.

S=brightness scale-up factor.

The spectral radiance W/cm of N (λ)=light source ²Srnm,

d(λ)＝5nm。

The measurement of NVIS radiation intensity NRI:

The measurement of NVIS radiation intensity NRI is as the measurement of conventional light intensity; Concerning the measure theory of the radiation intensity NRI of NVIS; As long as a category-A and consistent photometry detector of category-B relative spectral response degree with NVIS of design, with on the cosine calibrating device just can measure the radiation intensity NRI of the NVIS of measured light:

NRI=do not have the brightness scale-up factor category-A NVIS spoke brightness * distance square

That is: NRI=G (λ) _AL ²

In the formula: G (λ) _ABe the category-A spectral radiance of NVIS, l is that measured light is to the distance between detector.

For the test of light source light spectrum radiance, on optical fiber, can be arranged to image optical system, imaging optical system is coupled to spectrometer again with the photoimaging that measured light sends behind the termination of optical fiber; But because the fibre core of optical fiber is very thin; Image quality requirement to imaging optical system is very high, and in measurement, need imaging optical system be aimed at the position of the light-emitting area of measured light; Operation easier is very big, and test error is also bigger.Therefore, the utility model does not adopt imaging optical system, and adopts the cosine corrector, and cosine corrector and precise light hurdle are arranged on the incident termination of optical fiber, and the effect on precise light hurdle is to count the luminous energy of penetrating through the planimeter on light hurdle.The cosine corrector can be proofreaied and correct the angular response characteristic of optical fiber, makes it to meet cosine characteristic, and this has no special requirement for aiming at measured light, thereby is applicable to the light source of measuring different big or small light-emitting areas easily.

The structured flowchart of the utility model is as shown in Figure 5; The optical fiber of the light that measured light sends behind the cosine corrector is coupled to the entrance slit of spectrometer; Exit slit at spectrometer is provided with the CCD photoelectric sensor; After the CCD photoelectric sensor was transformed into electric signal with the light signal that receives, through linking to each other with computing machine through USB interface behind the A/D converter, computing machine carried out data acquisition and processing (DAP) through the test Control Software to the spectral radiance of measured light again; Transfer different calibration coefficients, realize the test of luminosity, category-A NVIS, category-B NVIS spectral radiance and NVIS radiation intensity.

The instrument band spectrophotometric spectra instrument system of the utility model; The CCD photoelectric sensor is an array type; Its spectral range is 380nm-930nm; Can under the radiation event that standard sources provides, accurately measure the relative spectral response degree and the absolute spectral response degree of detector, distribute according to the relative spectral response degree of the detector relative spectral response degree that adopts the accurate tuning detector of digital fit method that distributes then, make itself and standard V (λ), category-A NVIS, category-B NVIS spectral distribution in full accord; Coupling can be accomplished error free, and classic method can't be accomplished.

The utility model also can be provided with light-operated synchronizer trigger in spectrometer; When measured light is flasher; The passage of scintillation light that measured light sends behind light-operated synchronizer trigger, through the synchro control test macro realize to the duration greater than the luminosity of the flasher of 10ms, the test of NVIS radiation intensity.

In order to ensure test result accurately and reliably, the utility model can at first be proofreaied and correct the wavelength accuracy of spectrometer, and error control is less than 1nm, and correcting result is listed in table 1.

Table 1: spectrometer is with the result of mercury lamp calibration

Standard value (nm) 365.0 404.6 435.8 546.1 577.0 579.0

Instrument test value (nm) 365.2 404.4 435.7 546.3 576.7 578.9

After wavelength calibration is accomplished; Again the absolute spectral response degree of spectrometer is calibrated; After calibration is accomplished, the accurate relative spectral response degree of alignment light spectrometer under the duty of standard lamp, and spectrometer carried out the calibration calibration of category-A and the category-B of V (λ) luminosity, NVIS; Numeral match calibration curve is respectively like Fig. 6, Fig. 7, shown in Figure 8.The result who has demarcated test one reference standard lamp behind the spectrometer lists in table 2.

Table 2: the result of spectrometer test reference standard lamp:

Calibration factor is kept in the testing software of luminosity, NVIS radiation intensity NRI; Need the object of test through click, just can test accurately the NVIS radiation intensity of the luminosity of all light sources, aircraft exterior lighting light fixture and category-A or category-B spectral radiance with this instrument.

Claims (3)

1. based on spectrophotometric spectra luminosity, night vision radiation intensity tester; It is characterized in that: comprise optical fiber, spectrometer, CCD photoelectric sensor, A/D converter and computing machine successively by light path, be provided with cosine corrector and precise light hurdle in the incident termination of said optical fiber.

2. as claimed in claim 1 based on spectrophotometric spectra luminosity, night vision radiation intensity tester, it is characterized in that: in said spectrometer, be provided with light-operated synchronizer trigger.

3. as claimed in claim 1 based on spectrophotometric spectra luminosity, night vision radiation intensity tester, it is characterized in that: the spectral range of said CCD photoelectric sensor is 380nm-930nm.

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