摘要
一般的光声光谱仪都只给出光声信号的幅度谱,而没有给出连续相位谱。然而光声信号的相位信息可提供所测样品的许多重要特性。本文提出了利用正交数字相敏检测方法,同时提取光声信号的幅度谱和连续相位谱。
Common photoacoustic spectrum instruments only give amplitudespectra of photoacoustic signals and can't give continuous phase spectra.But Photoacoustic siginal's phase imformation can supply many importantcharacters of detected samples.This paper puts forward a plan of extractingphotoacoustic signal's amplitude and continous phase spectra by usingmultiple signal average and digital phase sensitive detection methods.Throughexperiments with typical samples,we can see because of the obtainment ofcontinuous phase spectra,we can get more information.It has some meaningin researchs and applications of photoacoustic spectrum.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
1991年第1期40-47,共8页
Chinese Journal of Scientific Instrument
