PHOTO FREQUENCY ALTERATION VALUE MEASURING METHOD USING PHOTOACOUSTIC EFFECTS

摘要

The present invention provides two optical feedback to the laser light having the original frequency and the frequency difference into the laser resonator an optical frequency shift amount measuring method using a photoacoustic effect to measure a frequency difference between the frequency is started. ; in the present invention is how to measure the frequency shift amount, regardless of the noise generated during the laser discharge as well as providing, by means of a laser generator to the detector itself it can be reduced in a long life, and which can make the structure simple and reduce the manufacturing cost. To this end, the present invention is to change the phenomenon appears as the original frequency of the laser light P is incident on the measurement object reaction was irradiated with a laser beam to be measured in the water, to be measured reflected by the water and scattering the laser light and having a changed frequency from and the light source by feedback from the laser resonator to a photoacoustic effect generated corresponding to the frequency difference between the two optical frequencies, this optical frequency shift amount using the photoacoustic effect hayeoseo to sense the acoustic sensing means is attached to one side of the laser resonator propose a measuring method. ; Accordingly, the present invention is able to accurately measure the frequency shift amount, it is possible to minimize the frequency with which the shift amount detecting means to economic benefits the structure zone effect There is.