光谱学与光谱分析
光譜學與光譜分析
광보학여광보분석
SPECTROSCOPY AND SPECTRAL ANALYSIS
2014年
6期
1711-1715
,共5页
高志帆%曾立波%石磊%李凯%杨远洲%吴琼水
高誌帆%曾立波%石磊%李凱%楊遠洲%吳瓊水
고지범%증립파%석뢰%리개%양원주%오경수
光谱仪%MEMS%线传感器阵列%中红外%水中油
光譜儀%MEMS%線傳感器陣列%中紅外%水中油
광보의%MEMS%선전감기진렬%중홍외%수중유
Spectrometer%MEMS%Linear sensor array%Mid-infrared%Oil in water
针对传统光谱测油仪存在的环境适应能力弱、分析速度慢、测量重复性差等问题,研制了一种便携式中红外水中油浓度速测仪。其核心光路采用典型的非对称折叠式 M型 Czerny-Turner 光学结构,有效缩小仪器体积;使用周期性转动的斩光器调制红外光源,并对斩光器转速进行数字PID控制,调制精度达到±0.5%;采用固定光栅作为分光元件,无需光栅扫描装置且不存在转动误差;利用新型 ME MS红外线传感器阵列探测调制后的光谱信号,显著提高光谱采集速度。光学仿真及实验结果表明仪器光谱范围为2800~3200 cm-1,光谱分辨率达到6 cm-1(@3130 cm-1),信噪比达到5200∶1,谱图采集速度为13 ms·幅-1,吸光度标准偏差优于3×10-3,满足了水中油测定国家标准要求。与已有红外光谱测油仪相比,该仪器小型便携,分析速度快,测量精度高,抗震防潮性能好,特别适用于环境监测部门对水中油浓度的现场实时测量,因此在水质监测领域具有广阔的应用前景。
針對傳統光譜測油儀存在的環境適應能力弱、分析速度慢、測量重複性差等問題,研製瞭一種便攜式中紅外水中油濃度速測儀。其覈心光路採用典型的非對稱摺疊式 M型 Czerny-Turner 光學結構,有效縮小儀器體積;使用週期性轉動的斬光器調製紅外光源,併對斬光器轉速進行數字PID控製,調製精度達到±0.5%;採用固定光柵作為分光元件,無需光柵掃描裝置且不存在轉動誤差;利用新型 ME MS紅外線傳感器陣列探測調製後的光譜信號,顯著提高光譜採集速度。光學倣真及實驗結果錶明儀器光譜範圍為2800~3200 cm-1,光譜分辨率達到6 cm-1(@3130 cm-1),信譟比達到5200∶1,譜圖採集速度為13 ms·幅-1,吸光度標準偏差優于3×10-3,滿足瞭水中油測定國傢標準要求。與已有紅外光譜測油儀相比,該儀器小型便攜,分析速度快,測量精度高,抗震防潮性能好,特彆適用于環境鑑測部門對水中油濃度的現場實時測量,因此在水質鑑測領域具有廣闊的應用前景。
침대전통광보측유의존재적배경괄응능력약、분석속도만、측량중복성차등문제,연제료일충편휴식중홍외수중유농도속측의。기핵심광로채용전형적비대칭절첩식 M형 Czerny-Turner 광학결구,유효축소의기체적;사용주기성전동적참광기조제홍외광원,병대참광기전속진행수자PID공제,조제정도체도±0.5%;채용고정광책작위분광원건,무수광책소묘장치차불존재전동오차;이용신형 ME MS홍외선전감기진렬탐측조제후적광보신호,현저제고광보채집속도。광학방진급실험결과표명의기광보범위위2800~3200 cm-1,광보분변솔체도6 cm-1(@3130 cm-1),신조비체도5200∶1,보도채집속도위13 ms·폭-1,흡광도표준편차우우3×10-3,만족료수중유측정국가표준요구。여이유홍외광보측유의상비,해의기소형편휴,분석속도쾌,측량정도고,항진방조성능호,특별괄용우배경감측부문대수중유농도적현장실시측량,인차재수질감측영역구유엄활적응용전경。
Aiming at the existing problems such as weak environmental adaptability,low analytic efficiency and poor measuring repeatability in the traditional spectral oil analyzers,the present paper designed a portable mid-infrared rapid analyzer for oil con-centration in water.To reduce the volume of the instrument,the non-symmetrical folding M-type Czerny-Turner optical struc-ture was adopted in the core optical path.With a periodically rotating chopper,controlled by digital PID algorithm,applied for infrared light modulation,the modulating accuracy reached ±0. 5%.Different from traditional grating-scanning spectrophotome-ters,this instrument used a fixed grating for light dispersion and avoided rotating error in the course of the measuring proce-dures.A new-type MEMS infrared linear sensor array was applied for modulated spectral signals detection,which improved the measuring efficiency remarkably.Optical simulation and experimental results indicate that the spectral range is 2 800~3 200 cm-1 ,the spectral resolution is 6 cm-1 (@3 130 cm-1 ),and the signal to noise ratio is up to 5 200∶1.The acquisition time is 13 milliseconds per spectrogram,and the standard deviation of absorbance is less than 3 ×10-3 .These performances meet the standards of oil concentration measurements perfectly.Compared with traditional infrared spectral analyzers for oil concentra-tion,the instrument demonstrated in this paper has many advantages such as smaller size,more efficiency,higher precision,and stronger vibration&moisture isolation.In addition,the proposed instrument is especially suitable for the environmental monito-ring departments to implement real-time measurements in the field for oil concentration in water,hence it has broad prospects of application in the field of water quality monitoring.