CONCENTRATION DISTRIBUTION MEASURING DEVICE

摘要

PROBLEM TO BE SOLVED: To make the generation position of a pressure wave accurately identifiable by detecting the pressure wave generated by the photo-acoustic effect between the oscillation light of a light source and measurement object molecules, converting it into a concentration signal or an alarm signal, and obtaining the time difference between luminescence and the detection of the pressure wave. SOLUTION: A pulse laser beam 13 with the light absorbing wavelength of measurement object molecules 11 in a medium M is oscillated by a pulse laser light source 12a, a pressure wave PW is generated by the photo-acoustic effect with the measurement object molecules 11, and it is detected by a microphone 14a. A signal processing means 15 converts the detection signal into the concentration signal out1 of the measurement object molecules 11 and also converts it into the leakage signal out2 of molecules such as an alarm signal to operate an alarm unit. A time difference measuring means 16 detects the time difference between the oscillation time of the pulse laser light source 12a and the detection time of the microphone 14a, and a position identifying means 17 identifies the distance to the measurement object molecules 11. A concentration distribution display means 18 forms and displays the concentration distribution diagram of the measurement object molecules 11 from the position signal an the concentration signal out1.