RU2260777C2 - Method for determination of transmission spectra in visible area of materials with variable optical density - Google Patents

Abstract

FIELD: research of materials with variable optical density with the aid of optoelectronic aids, in particular, creation of instrumental methods for determination of transmission spectra in the visible area of protective materials of means of individual protection of eyes against high-intensive thermal injurious factors such as luminous radiation of an explosion, for example, of a nuclear one, etc.

SUBSTANCE: use is made of a video camera with a spectrometric cap and a video recording of the light pulse from the source of optical radiation simulating a high-energy burst radiation that has passed through the protective material of means of individual protection of eyes.

EFFECT: provided research in determination of transmission spectra in the visible area of protective materials in the conditions of action of highly intensive optical radiations, as well as of their variation during the process.

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Description

The invention relates to the field of research of materials with variable optical density using optoelectronic means, and in particular to the creation of instrumental methods for determining the transmittance spectra in the visible region of protective materials for personal eye protection (SIZG) from high-intensity thermal damaging factors (TPF), which light from an explosion, such as a nuclear explosion, etc.

Known methods for determining the transmission spectra of protective materials for SIZG in conditions of exposure to optical radiation by using a fleet of spectral equipment of the optical range that implements various analytical methods - atomic absorption, atomic emission, atomic fluorescence, spectrofluorescence / 1 /.

However, these methods cannot be implemented under the influence of high-intensity thermal damaging factors. In addition, the use of known methods for determining the spectral characteristics of optically translucent materials does not allow an assessment of the change in the protective properties of samples over time of the process of exposure to a real (or simulated) thermal damaging factor.

The objective of the present invention is to develop a technical solution that provides the possibility of assessing the transmission spectra in the visible region of the SIZG materials under the influence of high-intensity optical radiation, as well as their changes in time of the process.

The problem is solved by using a video camera with a spectrometric nozzle VFU-1/2 / and performing video recording of the light pulse from the source of the optical study, passed through the protective material SIZG.

The generated video signal is transmitted through the input device to the computer with a digitizing board, which ensures its conversion from analog to digital form.

After that, the processing of the digitized image is carried out, which consists in determining, using the standard graphics editor Adobe Photoshop 4.0 / 3 / parameters R, G and B, the image of the spectral lines and calculating from them the wavelength and relative intensity of the radiation transmitted through the protective material.

The wavelength is determined according to the color table of the International Commission on Lighting (CIE) / 4 /. For this, the chromaticity coordinates X, Y and Z are calculated, which are the input parameters in the chroma table:

To assess the feasibility of the invention, the transmission spectrum in the visible region was determined for the protective material FHS-4/5 / using a camera \ Panasonic M40 \, spectrometric nozzle VFU-1, Intel P-II-350 computer with an AV Master digitizing board. High-energy optical radiation was simulated using a radiation panel with 12 DKSTL-10000 lamps.

A pulsed action of light-heat flow on the protective material was carried out. The energy value of the irradiation pulse was 63 J / cm ² , and the pulse duration was 0.92 s.

Analysis of the dynamics of changes in the transmission spectrum of the material FHS-4, shown in the drawing, showed that over time the throughput of the translucent material of high-energy optical radiation decreases in the entire visible region of the spectrum. It should be noted that after 0.5 s after the start of irradiation no reliable quantitative and qualitative changes in the spectral composition of the optical radiation transmitted through the photochromic material were observed. That is, most likely, at this point in time, photoinduction of the studied materials under the action of high-energy optical radiation ceases.

It should be noted that since the video recording speed is 25 frames / s, the determination of spectral characteristics can occur with a resolution of 0.04 s, i.e. the proposed method allows the determination of the spectral characteristics of samples in fast processes.

To clarify the quantitative errors of the calculated values of the transmission spectra in the visible region of the optical radiation, we checked their adequacy to the experimental spectral characteristics. The check was carried out by comparing the calculated wavelength region of the recorded optical radiation of the SCR 3-0.3 lamp passing through the filter with the transmission region of standard filters. In the experiment, filters were used with a transmission range of 546 ± 27.3 nm and 616 ± 30.8 nm / 6 /. The comparison results are presented in the table.

The presented data clearly indicate the high reliability of the data obtained using the proposed method.

Table. Comparison results of the transmission area of the light filters and the calculated values of the spectrum of the optical radiation of the lamp OPZ 3-0.3 The transmission area of the filter, nm The average values of the calculated spectral values (n = 3), nm Error, % 546 ± 27.3 542 ± 5.0 0.7 616 ± 30.8 635 ± 11.0 3,1

Thus, the stability and accuracy of measurements, excluding subjective errors, as well as the possibility of studying highly dynamic processes using digital video processing technology, determine the appropriateness of using the proposed method for determining the transmission spectra in the visible region of samples when assessing the protective properties of the SIZG.

Bibliography

1. Sorokin A.M., Kachev V.V., Timoshin A.I., Moskovchin O.V. and other universal spectral complex of the visible and UV range // Instruments and experimental equipment, No. 3, 2001, S.102-107.

2. Spectrometric nozzle VFU-1. Technical description and instruction manual. - Zagorsk: 1974.- 22 p.

3. Ponomarenko S., Thitz A. Adobe Photoshop 4.0 in the examples. - SPb .: BHV - St. Petersburg, 1998, - 288 p.

4. Meshkov V.V. Fundamentals of lighting. - M .: Energy, 1979. - 368 p.

5. Safety glasses OPF. Technical conditions AF3.954.109TU. - Raisins: PO Box 8872, 1979. - 36 p.

6. Optical color glass. Technical conditions GOST 9411-81. - M .: Publishing house of standards, 1981. - 64 p.

Claims (1)

The method for determining the transmission spectra in the visible region of materials with variable optical density for personal eye protection, which consists in directing pulsed radiation to the material and recording the spectrum of the radiation attenuated by the material by a video camera with a spectrometric nozzle, characterized in that they use a source simulating high-energy explosion radiation , and the resulting video signal is converted from analog to digital form using a computer with subsequent calculation of the wavelength and relative intensity of the analyzed radiation.