本文選題：光譜學(xué)　切入點(diǎn)：可調(diào)諧二極管激光吸收光譜　出處：《激光與光電子學(xué)進(jìn)展》2015年12期 　論文類型：期刊論文

【摘要】：實(shí)驗(yàn)設(shè)計(jì)了一種基于可調(diào)諧二極管激光吸收光譜技術(shù)的甲烷傳感系統(tǒng),主要針對(duì)寬溫度范圍、全濃度、高精度的實(shí)時(shí)檢測儀器進(jìn)行研究。優(yōu)選1653.7 nm窄線寬分布反饋式激光器作為光源,采用多次反射氣室,結(jié)合波長調(diào)諧和全數(shù)字鎖相放大器的二次諧波信號(hào)檢測技術(shù),通過最小二乘法擬合不同溫度和不同濃度下的二次諧波測量數(shù)據(jù),對(duì)檢測系統(tǒng)進(jìn)行背景扣除和溫度補(bǔ)償,高精度地反演出甲烷氣體的濃度。實(shí)驗(yàn)結(jié)果表明,系統(tǒng)在濃度為0~1%時(shí)的檢測誤差小于±0.02%,1%~100%時(shí)檢測誤差小于真值的±2%,響應(yīng)時(shí)間小于10 s。長時(shí)間的穩(wěn)定性測試和高低溫實(shí)驗(yàn)證實(shí)該系統(tǒng)可靠性高,能夠穩(wěn)定工作在寬溫度范圍內(nèi)(0℃~40℃)。該系統(tǒng)滿足煤礦檢測標(biāo)準(zhǔn)的要求,為防治瓦斯突出災(zāi)害提供了保障。
[Abstract]:An experimental methane sensing system based on tunable diode laser absorption spectroscopy is designed. The high precision real-time detection instrument is studied. A 1653.7 nm narrow linewidth distributed feedback laser is chosen as the light source, and the second harmonic signal detection technology is adopted in combination with wavelength tuning and digital phase-locked amplifier. The second harmonic measurement data at different temperature and different concentration were fitted by least square method, and the background deduction and temperature compensation were carried out on the detection system, and the methane concentration was reversed with high precision. The experimental results show that, The detection error of the system at the concentration of 0 ~ 1 is less than 鹵0.02 and less than 鹵2 when the detection error is less than the true value, and the response time is less than 10 s. The reliability of the system is proved by long time stability test and high and low temperature experiments. The system can work stably in a wide temperature range from 0 鈩，

本文編號(hào)：1595907