Wenhai Ji, Di Song, Yue Jiao, Longyan Ma, Guolin Li. Methane Telemetry Based on Optical Path Automatic Collimation[J]. Acta Optica Sinica, 2020, 40(18): 1812001
- Acta Optica Sinica
- Vol. 40, Issue 18, 1812001 (2020)
Fig. 1. Diagram of telemetry device
Fig. 2. Optical power (DC) signal and spectrum (2f) signal of detection device
Fig. 3. Laser beam divergence angle under different driving currents. (a) In W direction; (b) in V direction
Fig. 4. Changes in the received optical power
Fig. 5. Variation of spot center position. (a) At 44 cm; (b) at 167 cm
Fig. 6. Zoom lens in ZEMAX simulation. (a) Structure of zoom lens; (b) deformation model of zoom lens surface affected by gravity
Fig. 7. Concentration calibration. (a) 2f spectra of methane at different concentrations; (b) relationship between peak-peak value of 2f signal and integral concentration
Fig. 8. Stability test. (a) CH4 concentration reading; (b) Allan variance curve
Fig. 9. Telemetry device and results. (a) Test for methane leaking in corridor; (b) optical devices of telemetry device; (c) test spectrum for methane concentration of 4.95×10-6
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Table 1. Improvement effect of electronically controlled zoom lens on receiving optical power
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Table 2. Measured and simulated values of deflection angle for different focal lengths of different models
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Table 3. Field test results
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