Spectral scan air monitor专利检索-红外发射二极管二极管真空电子管电子零件及设备专利检索查询-专利查询网

Spectral scan air monitor

阅读：546发布：2023-10-17

专利汇可以提供Spectral scan air monitor专利检索，专利查询，专利分析的服务。并且An apparatus for monitoring air pollution sources, such as, for example nitrous oxide (NO), sulphur dioxide (SO2), or sulphur trioxide (SO3) is disclosed. The apparatus includes a tunable diode laser as a transmitter of infrared energy. The diode laser is tuned in a periodic fashion such that the laser light emission wavelength is scanned through an absorption line of a pollutant gas. The tuning effect is produced by driving the diode laser with a current which is the sum of a d.c. and an a.c. current. The laser energy is transmitted to a beamsplitter. The beamsplitter divides the energy between a sample path and a reference path. The sample path may be an open air path or include a sample cell; the reference path contains a cell having a known concentration of the pollutant gas being monitored. A chopper is provided to alternately sample the radiation passing the sample and reference cells to a detector which produces an a.c. signal whose peak to peak difference value contains the information of the difference in concentration levels of the contaminant in the reference and sample paths. A feedback circuit is provided to feed-back a d.c. current, equivalent to the time difference between the offset in the center point of the diode emission and the center of the contaminant absorption line, to the laser drive circuit to provide automatic lock onto the center of the contaminant absorption line.，下面是Spectral scan air monitor专利的具体信息内容。

权利要求

2. Apparatus for monitoring atmospheric pollution comprising: a. A coherent light emitting means for emitting light of a selected pollutant''s wavelength through a light reference path and a light sample path having a pollutant sample therein; b. A reference cell containing a light Absorbing pollutant of known concentration positioned to absorb light in the light reference path; c. A detector means operatively responsive to light passing from the light reference path and the light sample path for producing electrical signal representations thereof; and d. An electrical signal processing means operatively responsive to the outputs of the detector means for producing lock-on signals coupled to the coherent light emitting means for maintaining the light emission wavelength at the center of the pollutant''s absorption band, and signals indicative of pollutant concentration for display.

3. Apparatus according to claim 2, wherein said coherent light emitting means is a tunable diode laser tuned to emit light having an absorption bandwidth substantially that of a selected light absorbing pollutant.

4. Apparatus according to claim 2, wherein said light emitting means comprises a drive current producing means for the coherent light emitting means having a d.c. source for producing a d.c. level component for centering the light emission wavelength at the center of a pollutant absorption band, and an ac source for producing a low frequency ac component for scanning the light emission wavelength linearly through the absorption band, a summing amplifier for combining the d.c. and a.c. signals and a modulator means modulating the combined d.c.-a.c. signals for producing a drive current for the coherent light emitting means.

5. Apparatus according to claim 2, further including a sample cell containing a light absorbing sample positioned to absorb light in the light sample path.

6. Apparatus according to claim 2, further including a light interrupting means positioned in the light reference path and the light sample path for alternately passing light therefrom to the detector.

7. Apparatus according to claim 2, wherein said signal processing means includes a differentiator operatively responsive to the electrical output of the detector for suppressing therefrom any signals representing particulates, and nearby interfering absorption bands, and a peak detector operatively responsive to the differentiator output for determining the amplitude of the differentiated voltage.

8. Apparatus according to claim 4, wherein said signal processing means further includes an electrical feedback means operatively responsive to the output of the electrical signal processing means for producing a dc correction voltage coupled to the summing amplifier of the drive current producing means whereby the light emitter means are locked onto the center line frequency of a selected pollutant absorption band.

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Spectral scan air monitor

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