Formation of quantitative imaging of gas emissions utilizing optical techniques.

摘要

Method for imaging gas distributions utilizing optical techniques, comprising: using gas correlation techniques for spectral identification of substances and cancellation of temperatures and emissivities of spatially varying background; the use of absorption of natural thermal background radiation or spectrum due to a selected Self Broadcast gas in a passive recording technique; and wherein two images, A and B are stored using a camera device infrared dual image adapted to a selected region of wavelengths in the absorption spectrum or emission gas it is present; A Is the infrared scene recorded in one image, the image directly. B does the same scene recorded with the infrared light passing a gas correlation cell; wherein a calibration procedure as follows is used: the background temperature is recorded using the information contained in image A; images corresponding zero A0 and B0, consisting of the self-radiation of the camera device dual image including correlation cell gases and electronic offset, are subtracted from A and B, wherein the level of individual zero in each pixel images has been determined before the gas measurement, recording a black body radiator at different temperatures and plotting the intensity of the pixel obtained relative to a theoretically calculated intensity, and the axis intercept of a straight line , which is adapted to the data, provides the zero level; images are digitally superimposed on the field of interest containing gas emissions, and the continuing image processing is limited to this field; an image correlation gases, G = (A-A0) / (B-B0) is calculated; concentration level is calculated at each pixel of the G image using a diagram showing the integrated transmission within the spectral profile selected according to the integrated concentration of the gas expressed in ppm x meter for the particular gas, temperature difference between the background temperature and the gas emission temperature, and absolute temperatures; and finally, the image resulting from the concentration of the gas is superimposed on a visible image C of the scene and the result is displayed.