Shozo Morimoto

SPECTROSCOPIC GAS-FLOW IMAGING THROUGH AN INFRARED OPTICAL FIBER BUNDLE

Spectroscopic imaging was achieved in the midinfrared region by using a PtSi charge coupled device camera and band-pass filters. A coherent bundle of chalcogenide glass fibers was used as an infrared image guide to realize the remote observation of inaccessible objects. Infrared images taken at 1/60 s intervals represented transient distributions of molecules that absorb the probe infrared light. Real-time observation of bursting CH4 and CO2 gases was successfully demonstrated.

Infrared imaging spectrometry by the use of bundled chalcogenide glass fibers and a PtSi CCD camera

A coherent fiber bundle for infrared image transmission was prepared by arranging 8400 chalcogenide (AsS) glass fibers. The fiber bundle, 1 m in length, is transmissive in the infrared spectral region of 1 - 6 micrometer. A remote spectroscopic imaging system was constructed with the fiber bundle and an infrared PtSi CCD camera. The system was used for the real-time observation (frame time: 1/60 s) of gas distribution. Infrared light from a SiC heater was delivered to a gas cell through a chalcogenide fiber, and transmitted light was observed through the fiber bundle. A band-pass filter was used for the selection of gas species. A He-Ne laser of 3.4 micrometer wavelength was also used for the observation of hydrocarbon gases. Gases bursting from a nozzle were observed successfully by a remote imaging system.© (1999) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.