Measurement of Signal to Noise Ratio of UV Image Intensifier Assembly
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摘要:
为了实现对紫外像增强器信噪比的准确测量，建立了信噪比测量装置。首先，基于紫外像增强器的工作原理，结合已有微光像增强器信噪比测试方法，测算了紫外像增强器信噪比测试所需要的入射辐射功率；其次，从紫外波段参数测量的量值传递性出发，提出了基于测算辐射强度小光点成像探测的紫外像增强器输出信噪比测试方法；然后，基于确定辐射强度小光点成像探测方法建立了紫外像增强器信噪比测试装置，并分析了该装置的测量不确定度；最后，利用校准后的测试装置测量了某型紫外像增强器的信噪比，得到了较高的测量重复性。结果表明，采用基于确定辐射强度小光点成像探测方法的紫外像增强器输出信噪比测试装置的不确定度为13.3%，利用该装置测试得到的紫外像增强器信噪比结果为15.3，测量结果的重复性偏差为2.86%，满足了紫外告警等应用场景对高信噪比紫外像增强器的测量要求。
Abstract:To comprehensively evaluate the performance of a UV image intensifier, a testing apparatus was established for measuring the signal-to-noise ratio of the UV image intensifier assembly. First, according to the working principle of the UV image intensifier and the method used to test the SNR of the low-light-level image intensifier, the incident radiation power required to measure the SNR of the UV image intensifier was calculated. Second, based on the measurement of the ultraviolet wavelength parameters, a method for testing the signal-to-noise ratio (SNR) of the UV image intensifier with a small-spot imaging detection is proposed. Subsequently, based on the detection method of small-spot imaging for determining the radiation intensity, an SNR measurement device was established for the UV image intensifier, and the measurement uncertainty of the device was analyzed. Finally, the SNR of the ultraviolet image intensifier was measured using a calibrated test device, and the measurement repeatability was high. The results showed that the uncertainty of the UV image intensifier SNR test device based on the detection method of small-spot imaging with the determined radiation intensity was 13.3%, the SNR of the UV image intensifier was 15.3, and the repeatability deviation of the SNR was 2.86%. This satisfies the measurement requirements of UV image intensifiers with a high SNR in ultraviolet alarms and other application scenarios.
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图 3 微光像增强器信噪比测试系统
Figure 3. Testing system for SNR of the low-light-level image intensifier
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图 4 紫外像增强器信噪比测试装置
Figure 4. Testing apparatus for measuring the signal to noise ratio of UV image intensifier assembly
表 1 入射光辐射照度重复性测量数据
Table 1 Testing data of incident irradiance
No. 1 2 3 Radiant/(W/m2) 1.89×10-6 2.11×10-6 2.05×10-6 No. 4 5 6 Radiant/(W/m2) 1.91×10-6 1.95×10-6 2.12×10-6 
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表 2 紫外像增强器信噪比测试结果
Table 2 Testing data of signal to noise ratio of UV image intensifier assembly
No. 1 2 3 4 5 6 Ave SNR 15.4 14.8 15.9 14.8 15.6 15.3 15.3
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