体吸收、边电极热电探测器的分析

本文用一维热扩散模型推出了体吸收、悬空型、边电极热电探测器响应率的表达式,并计算了SBN热电探测器的响应率和NEP与材料的吸收系数、器件厚度、工作频率以及前置放大器输入电容之间的关系。本文认为:1.体吸收、悬空型、边电极热电探测器具有最佳响应率厚度和最佳NEP厚度。两种最佳厚度可以根据本文导出的响应率公式和已知的噪声公式计算出来。2.在某些波段,如果能把材料的吸收系数提高到5×10⁴cm^-1以上,就可以研制性能优良的体吸收薄膜器件。

ANALYSIS OF THE BULK-ABSORBING PYROELECTRIC DETECTORS WITH EDGE ELECTRODES

The pyroelectric response of the bulk-absorbing and free-bearing pyroelectric detectors with edge electrodes is deduced by using the one-dimensional diffusion theory. The pyroelectric response and NEP of the detectors are calculated as functions of detector thickness and working frequency. It is found that the detectors have optimum thickness of response and NEP. If the absorption coefficient of material can be increased beyond 5×10⁴cm^-1, the performance of the bulk-absorbing thin film detectors approach that of surface absorbing ones.