Viola Roberto
Consorzio Centro Ricerche Electtro-Ottiche, L'Aquila, Italy.
Appl Opt. 2006 Apr 20;45(12):2805-9. doi: 10.1364/ao.45.002805.
An original imaging multipass cell for infrared spectroscopy has been designed and built. The cell design is aimed at overcoming intrinsic sensitivity limitations associated with the low specific spectral radiance power of blackbody sources. Owing to the implemented low f number, the detector collects a large amount of the energy emitted over a wide angle by a blackbody source. In addition, the adopted optical configuration allows maintenance of the same spatial distribution of the radiance pattern at the cell entrance and exit (imaging capability) within an aperture area of several square millimeters. This feature allows the use of uncollimated blackbody-type emitter arrays and infrared sensor arrays coupled with linear, spectrally variable filters, and performance of spectroscopic measurements of infrared absorption for low concentrated gases detection. In the present design the cell has an f number of about 2, and the optical path is ten times larger than the cell length.
已设计并制造出一种用于红外光谱的新型成像多程池。该池的设计旨在克服与黑体源低比光谱辐射功率相关的固有灵敏度限制。由于采用了低f数，探测器收集了黑体源在广角范围内发射的大量能量。此外，所采用的光学配置允许在几平方毫米的孔径区域内保持池入口和出口处辐射图案的相同空间分布（成像能力）。这一特性允许使用非准直的黑体型发射器阵列和与线性、光谱可变滤光片耦合的红外传感器阵列，并对低浓度气体检测进行红外吸收光谱测量。在当前设计中，该池的f数约为2，光程比池长度大十倍。
