本文選題：氣相過氧化氫　切入點：可調(diào)諧半導體激光吸收光譜　出處：《浙江大學》2015年碩士論文

【摘要】：近年來,氣相過氧化氫應用于殺菌消毒的場景越來越廣泛,但是目前缺乏對氣相過氧化氫有效的在線檢測手段。本文基于可調(diào)諧半導體激光吸收光譜(TDLAS)原理進行了氣相過氧化氫傳感系統(tǒng)的研究。TDLAS測量原理的理論基礎是Beer-Lambert定律,本文第二章重點介紹了該定律的物理意義,對波長調(diào)制技術進行了理論闡述,了解了利用二次諧波信號反演出氣體濃度值。介紹了利用HITRAN數(shù)據(jù)庫查詢氣體吸收峰的方法。利用TDLAS原理進行氣體濃度檢測的一個重點問題是確定目標氣體的吸收譜線。由于高精度分子躍遷吸收數(shù)據(jù)庫中尚未更新氣相過氧化氫在近紅外波段的’吸收譜線數(shù)據(jù),本實驗的難點之一便是尋找氣體在近紅外波段的吸收峰。結(jié)合文獻調(diào)研和電流、溫度調(diào)節(jié)的辦法,本文實驗成功找到了目標氣體的一個較強吸收吸收峰。在找到氣相過氧化氫的吸收峰之后,實驗的另一個重點內(nèi)容便是編程處理得到的實驗數(shù)據(jù)。本文實驗基于Lab VIEW給出了具體的處理程序,通過GPIB控制鎖相放大器時序采集二次諧波信號和一次諧波信號,將實時采集到的二次諧波與一次諧波信號相除并扣除背景噪聲,所得信號的吸收峰的值即為實驗得到的相對濃度值。實驗還研究了初始時刻信號的穩(wěn)定性、以及濕度對實驗測量的影響,驗證了TDLAS系統(tǒng)的穩(wěn)定性,并且給出了濕度影響的解決辦法。最后通過多臺電化學傳感器同時測量的方法標定TDLAS相對濃度值,給出了實驗系統(tǒng)的擬合多項式,得到系統(tǒng)精度為25ppm,探測范圍為100-1500ppm,靈敏度為1543ppm/V,從而實驗驗證了TDLAS系統(tǒng)的可行性。
[Abstract]:In recent years, gaseous hydrogen peroxide has been widely used in sterilization and disinfection. However, there is no effective on-line detection method for gas phase hydrogen peroxide. In this paper, the gas phase hydrogen peroxide sensing system based on tunable semiconductor laser absorption spectroscopy (TDLAS) is studied. The theoretical basis of the measurement principle of TDLAS is Beer-Lambert 's law. In the second chapter, the physical meaning of the law is introduced, and the wavelength modulation technology is described theoretically. The method of querying gas absorption peak by using HITRAN database is introduced. A key problem of gas concentration detection using TDLAS principle is to determine the absorption of target gas. Spectral lines. As the 'absorption line data of gaseous hydrogen peroxide in the near infrared band have not been updated in the high-precision molecular transition absorption database, One of the difficulties of this experiment is to find the absorption peak of gas in near infrared band. In this paper, we have successfully found a strong absorption peak of the target gas, after finding the absorption peak of hydrogen peroxide in the gas phase, Another important content of the experiment is the experimental data which is processed by programming. Based on Lab VIEW, a specific program is given in this paper. The second harmonic signal and the first harmonic signal are collected by the GPIB control phase locked amplifier, and the second harmonic signal and the first harmonic signal are collected by the GPIB control amplifier. The second harmonic signal and the first harmonic signal collected in real time are divided and the background noise is deducted. The value of the absorption peak of the obtained signal is the relative concentration obtained from the experiment. The stability of the signal at the initial time is also studied in the experiment. The stability of TDLAS system is verified and the solution of humidity effect is given. Finally, the relative concentration of TDLAS is calibrated by multiple electrochemical sensors simultaneously. The fitting polynomial of the experimental system is given. The precision of the system is 25ppm, the detection range is 100-1500ppm, and the sensitivity is 1543ppm / V, thus the feasibility of the TDLAS system is verified experimentally.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ123.6;TN249

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