Patent ID: 8107061
Filing Date: 2012-01-31
Classification: G01H,G01P,G01S

Abstract:
1. An acoustic measurement device comprising: an optical system in which a light beam is passed through a given measurement point in a jet flow, and a brightness signal obtained by converting the brightness of the light beam into an electrical signal is outputted; an interface adapted to convert the brightness signal into brightness data at a predetermined sampling frequency; a first storage section for storing the brightness data, sampling time information, and measurement position information associated with the measurement point; a Fourier transform section adapted to perform Fourier transform on the sampling time information and the brightness data for each measurement position information to obtain frequency component information and amplitude data; a second storage section for storing the measurement position information, the frequency component information and the amplitude data; an analysis frequency selecting section adapted to take out the amplitude data associated with a particular frequency component from the frequency component information accumulated in the second storage section; an Abel inversion section adapted to convert the amplitude data taken out by the analysis frequency selecting section into density gradient information of the jet flow at a radial position from the center of the jet flow; a third storage section for storing radial position information and the density gradient information obtained by the Abel inversion section; a display processing section for performing visualization processing on the radial position information and the density gradient information accumulated in the third storage section; and a display for displaying the processing result of the display processing section.