Qing-chuan ZHAO. Development of an Infrared Methane Sensor Based on Double Narrow-band LED Light Source[J]. Acta Photonica Sinica, 2020, 49(6): 0628002
- Acta Photonica Sinica
- Vol. 49, Issue 6, 0628002 (2020)
Fig. 1. Absorption spectrum of CH4, H2O around 3.3 μm
Fig. 2. Principle block diagram of infrared methane sensor system
Fig. 3. Spectra of main absorption peaks of LED34, LED27, PD36 and CH4
Fig. 4. Design diagram of sampling chamber
Fig. 5. Emission spectra of LED34 under different current
Fig. 6. Circuit diagram of photosensitive signal processing
Fig. 7. Curve of temperature compensation coefficient
Fig. 8. Physical figure of infrared methane sensor and detection system platform
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Table 1. Measurement value of infrared methane sensor under standard gas concentration in the temperature range of -20~50℃
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Table 2. Measured value of infrared methane sensor under the standard gas concentration in the humidity range of 25% ~ 95%RH
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Table 3. Basic performance parameters of sensor
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