CH4 laser gas analyzer

Laser gas analysisceremonyBased on tunable semiconductor laser absorption spectroscopyskilltechnique,This technology utilizes the narrow linewidth and tunable properties of semiconductor lasers feature(As shown in the figure, the bandwidth of the laser light source is 1/106 of that of the infrared spectroscopic light source), for gases Analyze the individual absorption spectral lines of the molecule. By modulating semiconductor lasers Using current to modulate the laser frequency, causing the semiconductor laser to emit a specific wavelength When the laser beam passes through the measuring pipeline, it is selectively absorbed by the measured gas, resulting in laser Intensity attenuation, using a lock-in amplifier to detect the optical signal of the receiving end photodetectorNumber is demodulated and combined with gas concentration and infrared or laser absorption spectrahere Beer-Lambert[1] Relationship, AcquisitionThe concentration of the gas being measured.

Laser gas analysisceremonyTechnical Specifications

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1No need for sampling preprocessing system, overcoming the problem of dust, tar and other blockages in sampling probes

2Not affected by background gas cross interference The laser spectrum emitted by semiconductor lasers is very narrow, much smaller than that of the measured gas The absorption spectral line width, whose wavelength scanning range only includes the single absorption spectral line of the measured gas,Excluding other gas groups The collection of spectral lines theoretically avoids the cross absorption interference of background gas components on the measured gas.

3Fast response speed The laser online gas analysis system realizes online measurement and second level response, achievingReflecting process gas Body concentration avoids safety hazards caused by delayed sampling preprocessing.

4high measurement accuracy The system adopts a real-time online measurement working mode, and the gas information is not easily distorted. The measured value is The average concentration of gas lines is higher compared to the sampling point concentrationMeasurement accuracy.

5Strong anti-interference ability The wavelength of semiconductor lasers can be changed by adjusting the operating current, so that the laser wavelength can be scanned Described areas with gas absorption and scanned areas without gas absorption. Measurable when the wavelength is in the absorption region Total transmittance including gas and dustT Overall, when the wavelength is located in the region without gas absorptionDust can be measured in the domain transmittanceT Dust can accurately obtain the transmittance of the measured gasT qi body =T total/ T Dust. Make the instrument Has good performance in harsh measurement environments such as high temperature, high dust, high moisture, high corrosiveness, and high flow rateAdaptability.

6Explosion proof type with high safety factor The equipment has passed the national explosion-proof electrical production standardsQuality Supervision and Testing Center conducts testing, At the same time, the instrument has also passed mechanical inspection and impact testing IP Experiment, temperature test, thermal shock test, surgical pressure resistance test Seven tests, including experiments and internal ignition non explosion experiments, have a high safety factor.

7Easy maintenance and calibration The annual calibration frequency of the laser online gas analysis system is higher than that of traditional analyzers1/4~1/8, The maintenance work is so simple that only the optical window needs to be wiped clean.