摘要:
Concentrations of a target analyte in a gas mixture containing one or more background analytes having potentially interfering spectral absorption features can be calculated by compensating for background analyte absorption at a target wavelength used to quantify the target analyte. Absorption can be measured at a reference wavelength chosen to quantify the concentration of the background analyte. Using a background gas adjustment factor or function, the absorption measured at the reference wavelength can be used to calculate absorption due to the background analyte at the target wavelength and thereby compensate for this background absorption to more accurately calculate the target analyte concentration in real or near real time. Additional background analytes can optionally be compensated for by using one or more additional reference wavelengths.
摘要:
The present invention relates to optical sensor arrangements, especially sensors of the type that can be used in motor vehicles and which can detect hydrogen in a gaseous measured medium. According to the invention, an optical sensor arrangement has the at least one radiation source (108) for emitting radiation, the at least one measuring transducer which modifies its optical characteristics in response to the presence and/or concentration of at least one analyte in a measured medium (104) and is arranged so that it interacts with at least part of the emitted radiation (110), a first detector unit (112) for capturing a change in radiant intensity due to the changed optical characteristics of the measuring transducer and for outputting a first measuring signal and a light conducting body (106) which is transparent to the emitted radiation, wherein the measuring transducer, which is sensitive to the analyte, is arranged on at least one surface of the light conducting body (106) so that the emitted radiation impinges on a surface of the measuring transducer which faces away from the measured medium (104).
摘要:
The invention relates to a non-dispersive infrared gas analyzer (1) for identifying a test gas containing a number of gas constituents, comprising a radiation source (2), a modulating device (3), a measuring cell (4), which has a measuring chamber (4a) and a comparing chamber (4b), and comprising an optopneumatic detector unit (5) that has a first detector (5a), which, for measuring gas constituent A, is filled with gas constituent A, and has a second detector (5b), which is situated behind the first detector (5a) and which, for measuring gas constituent B, is filled with the isotope B* thereof.
摘要:
A micromachined integrated opto-fluidic or opto-acoustic sensor having a rapidly intensity-varying or pulsing light source, an interference filter, a gas cavity, which may or may not be an optical and/or acoustic resonator tuned to a particular wavelength of light, or sound frequency, into which the detected gas can diffuse into via a filter, and a fluidic or pressure sensor to detect the heating and cooling, and the resulting expansion and contraction of the gas due to the absorption of light at the particular wavelength by the specific gas being detected. The presence of other gases is inferred from the detected gas.
摘要:
A micromachined integrated opto-fluidic or opto-acoustic sensor having a rapidly intensity-varying or pulsing light source, an interference filter, a gas cavity, which may or may not be an optical and/or acoustic resonator tuned to a particular wavelength of light, or sound frequency, into which the detected gas can diffuse into via a filter, and a fluidic or pressure sensor to detect the heating and cooling, and the resulting expansion and contraction of the gas due to the absorption of light at the particular wavelength by the specific gas being detected. The presence of other gases is inferred from the detected gas.