紫外像增强器光谱响应特性测量方法研究

Spectral response measurement of UV image intensifier

为了能及时测量自制紫外像增强器的光谱响应特性,设计了一套简便的测量紫外像增强器光谱响应的系统。该系统由专用光源室、光栅光谱仪、直流稳压电源、皮安电流计4部分构成。用光栅光谱仪配套软件直接读出光源每个波长对应的辐射功率;用皮安电流计直接测量出各个波长的光照射光阴极时光阴极产生的光电流,然后求出这2个比值并用Microsoft Excel 2003进行处理,得到光电流与波长变化的曲线,即相对光谱响应曲线。从曲线可以看出,该紫外像增强器的光谱响应范围为200 nm-340 nm,峰值响应在270 nm附近,表明该紫外像增强器具有日盲特性。测试结果表明:系统不确定度<10%。

An ultraviolet spectral response measurement device was designed for measuring the UV image intensifiers fabricated in this laboratory. This system consists of a light source chamber, a grating spectrometer, a DC voltage regulator and a pi-ampere current meter. The radiant power corresponding to every wavelength of the light source was directly read out with the software of the grating spectrometer, the photocurrent generated from a photocathode was directly measured by the pi-ampere current meter when the photocathode was radiated by UV radiation sources, the ratio of the two measurements was then calculated and processed by Microsoft Excel 2003, and relative spectral response curve was obtained. The curve indicates that the spectral response of UV image intensifiers is from 200 nm to 340 nm and the peak response is near 270 nm, which indicates that the UV image intensifier is solar blind. Measurement results show that the uncertainty of the device is less than 10%.