초록 ▼

Instrumentation to detect the presence of, or to measure the concentration of, a gas or pollutant in a gaseous environment. With the use of spectroscopic techniques and energy beams having suitable wavelengths, the presence and concentrations of these can be detected and measured, not only in flowin

Instrumentation to detect the presence of, or to measure the concentration of, a gas or pollutant in a gaseous environment. With the use of spectroscopic techniques and energy beams having suitable wavelengths, the presence and concentrations of these can be detected and measured, not only in flowing streams such as in process streams or exhaust stacks, but above a ground area, around its perimeter, or across the road. A calibration means including an internal audit cell and a retrodirective reflector is also shown.

대표청구항 ▼

1. An instrument for detecting the presence of or for measuring the concentration of a gas in a large stream of other gases comprising; a spectral energy beam emitter for emitting a beam of spectral energy across said large stream of gasses; an analyzer for receiving and analyzing said beam of spec

1. An instrument for detecting the presence of or for measuring the concentration of a gas in a large stream of other gases comprising; a spectral energy beam emitter for emitting a beam of spectral energy across said large stream of gasses; an analyzer for receiving and analyzing said beam of spectral energy that has passed through and been converted from at least some part of said large stream of gases; a plurality of narrow band pass filters through which said beam of spectral energy is passed; an in-situ calibration audit cell for calibration across said large stream of gases, said audit cell comprising a cell having a fixed length filled with a high concentration reference gas proportioned to the gas concentration; whereby an in-situ calibration across said large stream of gases can be performed without removal of said analyzer.