SU449286A1 - Optical-acoustic gas analyzer - Google Patents

Description

The invention relates to analytical instruments and can be used for anamza gases in biological and industrial objects under conditions of mechanical stimulation (shock, rolling, linear accelerations, etc.).

An optical-acoustic gas analyzer containing a radiation source, a mechanical skirting device for modulating radiation, a working, comparative and filter chamber, a condenser receiver with two parallel membranes, amplifying and transforming devices are known. A disadvantage of the known optoacoustic gas analyzer is that, under the conditions of mechanical effects, the accuracy of its readings decreases.

In the proposed gas analyzer, this disadvantage is eliminated due to the fact that a shaper of light pulses is used as a mechanical obturator, which comes from a current pulse generator and standard incandescent lamps with light filters on a given radiation region. Incandescent lamps are placed in the measuring and comparative chambers coaxially with the central chamber of the beam in the impingement and on both sides of it. The measuring and comparative chambers are located in the case of a condenser radioreceiver.

The drawing shows a diagram of the detector.

The gas analyzer consists of a central I and external 2 and 3 chambers; chambers located in the case of a capacitor receiver 4; pipe 5 and channels 6, 7 and 8, which pass ha; membranes 9 and 10, condenser microphones II; current pulse generator 12; standard filament lamps 13 and 14; windows 15 and 16 of the central chamber; working 17 and comparative 1o cameras, amplifying and transforming devices

Ls

The gas analyzer works the same way.

Cameras 1, 2 and 3 of the receiver 4 are filled with the test gas through pipe 5 and channels 6, 7, 8, after which the channels close and regulate the tension of the membranes 9 TO and the initial capacitance of the condenser microphones II.

The variable light flux is Forlshiruetsya using a generator 12, the current pulses from which with a given duration alternately arrive at the reference glow lamp 13, 14, from the luminous flux into the central chamber I through the windows 1o and 16. The light flux from the lamp 13 passes through the chamber 17, through which the mixture to be analyzed is pumped through, and the light flux from the lamp 14 through the comparative chamber 18, where the sample under study is absent (it is absorbed by the hickshim absorber). As a result, light fluxes of varying intensity are obtained, which create a gas pressure drop in the central chamber relative to the external 2.3. Differential pressure effects on membranes 9,10,

cause a change in the capacitance of the capacitor microphone and, as a consequence, a change in the electrical signal applied to the amplifying and conversion devices 19,

SUCCESSES INVENTIONS

An optoacoustic gas analyzer containing a condenser beam generator with a central and external camera, a measuring, comparative camera, a shutter, characterized in that, in order to improve the accuracy of measurements of the gas analyzer under mechanical stress conditions, a light pulse former used as a shutter, consisting of current pulse generator and standard incandescent lamps, the incandescent lamps being placed in the measuring and comparative chambers and located coaxially with the central chamber the receiver and on both sides of it, and the measuring and comparative chambers are located in the housing of the condenser receiver.