矿用光纤气体检测中的最小二乘拟合方法研究

由于矿用光纤气体检测系统中线性最小二乘拟合方法只适用于光谱吸收率小于0.1的气体检测,针对光谱吸收率增大时气体吸收谱线与浓度的变化呈现非线性的问题,本文采用阻尼最小二乘拟合算法进行气体浓度的计算。实验结果表明,改进的矿用光纤气体检测系统检测极限由原来的100 ppm提高到了30 ppm量级,简化了标定程序,能够更好地满足煤矿安全生产的需求。

Least squares fitting in the detection for mine optical fiber gas detection

Linear least squares fitting is only applicable to gas detection whose spectral absorption rate is less than 0.1 in coal mine optical fiber gas detection. We present the calculation for gas concentration with damped least squares fitting for the nonlinear issue between the varieties of gas absorption spectrum and concentration if spectral absorption rate increases. Experimental results show that the detection limitation of the method based gas detector is improved from 100 ppm to 30 ppm.Data calibration procedure is also simplified, so the method can better satisfy the requirements of coal mines for secure production.