A device for measuring time-varying characteristics of radiation intensity in multiple bands in common field of view

Abstract

The invention relates to a device for measuring time-varying characteristics of common-view-field multi-waveband radiation intensity, which comprises a light limiting hole used for limiting a measuring field of view, a plano-convex lens used for changing a transmission angle, a plurality of 45 degree dichroic mirrors with different spectral wavelengths, a plurality of optical filters for transmitting light of different wavelength bands and a plurality of detectors for photoelectric conversion; the light-limiting hole and the plano-convex lens are coaxially arranged, a plurality of 45 degree dichroic mirrors are arranged at intervals in the axial direction of the light-limiting hole and the plano-convex lens at intervals, and the optical filters and the detectors are arranged on the reflecting and transmitting light paths of the dichroic mirrors furthest away from the plano-convex lens; the dichroic mirrors are additionally arranged on a reflection light path of any dichroic mirror except the dichroic mirror furthest away from the plano-convex lens, and the optical filters and the detectors are arranged on a reflection light path and a transmission light path of the additionally arranged dichroic mirror. The device can achieve the aim of measuring time-varying characteristics of common-view-field multi-waveband radiation intensity in the ultraviolet near infrared wavelength range.

Description

technical field [0001] The invention belongs to the technical field of radiation measurement, and in particular relates to a device for measuring time-varying characteristics of radiation intensity with multiple bands in a common field of view. Background technique [0002] Researches on ultra-high-speed collisions, hypersonic combustion, and high-temperature gas flow usually analyze the fireball temperature by measuring the time-varying characteristics of the radiation intensity of typical atoms, molecules, and ions in the characteristic radiation band in the collision fireball, combustion gas, and high-temperature gas flow. , fuel combustion efficiency, gas radiation characteristics, etc., to support collision radiation modeling, combustion verification analysis, flow field parameter analysis, ultra-high-speed target characteristic analysis, high-temperature gas non-equilibrium effect research, etc. [0003] The radiation intensity time-varying characteristic measurement s...

AI Technical Summary

Problems solved by technology

[0005] The first type of radiation intensity time-varying characteristic measurement device uses one-point multi-fiber, the receiving end is a single head, and multiple optical fibers are combined together, which basically solves the problem of multi-band measurement with the same field of view, but because the light from the optical fiber outlet directly passes through the filter The filter is incident on the detector, and the incident light passing through the filter has a considerable incident angle greater than 5°, which exceeds the limit requirement of the filter on the incident light angle, so that the light passing through the filter is not for detection. The wide bandwidth and transmittance make unnecessary light irradiate the detector, and the response sensitivity of the light incident on the detector at a large angle is different from that of light close to the vertical incidence

In addition, due to the limitation of the energy of the optical fiber and the calibration light source, it is difficult to calibrate the value within the range of the detector measurement curve.

Due to the comprehensive processing of measurement data, there are problems such as the actual measurement wavelength range and spectral response of the detector and the uncertainty of the spectral transmittance of the filter, and the calibration curve does not fully cover the measurement range.

[0006] The second and third types of radiation intensity time-varying characteristic measurement devices basically solve the problem of incomplete coverage of the calibration curve and other measurement ranges, but the measurement field of view of each band is different, and it also does not consider the incident light on the filter and the detector. Problems such as the incident angle on the sensor, combined cause the processing of measurement data to have problems such as the actual measurement wavelength range and spectral response of the detector and the uncertainty of the spectral transmittance of the filter, and the measurement field of view of each band is different, resulting in large data errors and It is difficult to do data correlation analysis

[0007] To sum up, these three types of measurement devices did not consider the impact of these problems during the data processing process, making the data reliability not guaranteed

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