초록 ▼

Light in two different wavelengths, only one of which is attenuated by the presence of a substance to be tested for, is passed through a light path which includes a fluid path. The two wavelengths are equally attenuated by particulate contamination and all other conditions except for the presence of

Light in two different wavelengths, only one of which is attenuated by the presence of a substance to be tested for, is passed through a light path which includes a fluid path. The two wavelengths are equally attenuated by particulate contamination and all other conditions except for the presence of the tested for substance. A light path through a reference cell provides a reference for each wavelength. The presence of the tested for substance provides a differential attenuation which is indicative of the presence of the substance and the degree of differential attenuation is a measure of the concentration of the substance.

대표청구항 ▼

A probe for detecting the presence of a substance in a fluid comprising: first body means to be sealingly secured in the wall of a casing containing a fluid to be tested; a passage through said first body means defining a flow path; first mirror means forming a portion of said passage; first optical

A probe for detecting the presence of a substance in a fluid comprising: first body means to be sealingly secured in the wall of a casing containing a fluid to be tested; a passage through said first body means defining a flow path; first mirror means forming a portion of said passage; first optical fiber means having one end received in said first body means and defining a first termination which is located across said passage from said first mirror means and forming a portion of said passage; said first optical fiber means having a second end defining a second termination; second body means to be sealingly secured in the wall of a casing containing a fluid to be tested; a sealed chamber in said second body means containing a reference medium; means for equalizing pressure in said sealed chamber with the pressure acting on said second body means; second mirror means forming a portion of said sealed chamber; second optical fiber means having one end received in said second body means and defining a first termination which is located across said sealed chamber from said second mirror means and forming a portion of said sealed chamber; said second optical fiber means having a second end defining a second termination; means for supplying light in a first wavelength which is attenuated in the presence of said substance and in a second wavelength which is not attenuated in the presence of said substance such that said light traverses a first path serially including said first optical fiber means from said second termination to said first termination, across said flow path where said light in said first wavelength is subject to attenuation due to the presence of said substance whereupon said light is reflected by said first mirror means and said light in said first wavelength is subject to further attenuation due to the presence of said substance and depending upon the attenuation said light enters said first termination of said first optical fiber means, passes through said first optical fiber means and out said second termination of said first optical fiber means and for supplying light in said first and second wavelengths to a second path serially including said second optical fiber means from said second termination to said first termination, across said sealed chamber to said second mirror means whereupon said light is reflected by said second mirror means and enters said first termination of said second optical fiber means, passes through said second optical fiber means and out of said second termination of said second optical fiber means; and means for detecting the amount of light in both of said wavelengths passing out of each of said second terminations.