Use of infra red camera to observe gas distributions, e.g. to locate natural gas leakage from underground pipe

摘要

A high-resolution infra red camera is employed. Its narrow-band spectral filter is adjusted for transmission of specific absorption lines of the gas to be detected. A halogen lamp actively illuminates the site of investigation, which is backed by an infra red reflector Preferred Features: To increase gas detection sensitivity, the gas distribution is located between the reflector and the camera. The camera is equilibrated with the illuminated reflector, such that parts of the scene which remain constant over time, do not contribute to picture contrast. For further enhancement of sensitivity, a diffuse infra red reflector is employed. This comprises e.g. an anodized aluminum panel. A measuring location is set up and equipped as described, to detect methane leaks from natural gas lines.