【摘要】：設計了一種基于溫控半導體激光波長掃描的光纖煤礦瓦斯測量系統(tǒng),通過改變中心波長1 653 nm半導體分布式反饋(DFB)激光器的工作溫度來掃描半導體DFB激光器的輸出波長,在5 nm波長掃描范圍內,存在明顯的瓦斯氣體吸收峰。半導體DFB激光器輸出的光注入被測氣體室,氣體室的輸出光攜帶有瓦斯氣體濃度信息,用光電探測器將光信號轉化為電信號,再由A/D采集卡采集到信號處理系統(tǒng),通過對有吸收峰位置的光功率和無吸收峰位置的光功率進行比較,則可計算出瓦斯?jié)舛�。該傳感系統(tǒng)采用80 m A恒流源驅動半導體DFB激光器,使其輸出光強保持不變,其結構簡單、靈敏度高。
[Abstract]:A kind of optical fiber coal mine gas measurement system based on temperature controlled semiconductor laser wavelength scanning is designed. The output wavelength of semiconductor DFB laser is scanned by changing the working temperature of 1 653 nm semiconductor distributed feedback (DFB) laser. In the range of 5 nm wavelength scanning, there is obvious gas absorption peak. The light output from the semiconductor DFB laser is injected into the gas chamber. The output light of the gas chamber carries the gas concentration information. The light signal is converted into an electric signal by the photodetector, and the signal processing system is collected by the A / D acquisition card. The gas concentration can be calculated by comparing the optical power with the absorption peak position and the optical power without the absorption peak position. The sensing system uses 80mA constant current source to drive the semiconductor DFB laser, which keeps the output intensity unchanged, and its structure is simple, and its sensitivity is high.
【作者單位】： 成都工業(yè)學院電子工程學院;北京理工大學光電學院;川煤集團芙蓉煤礦有限公司;
【基金】：省科技支撐計劃項目(2011GZ0254) 博士基金項目(2016RC005)
【分類號】：TD712;TN249

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