Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1996-11-07
1998-05-05
Nelms, David C.
Optics: measuring and testing
By particle light scattering
With photocell detection
356345, 356359, G01B 902
Patent
active
057483140
ABSTRACT:
A method for measuring a correlation function wherein correlation function is determined at a high speed without using a fast analog-to-digital convertor. According to the method, a correlation function between a first observation signal and a second observation signal in a predetermined observation frequency band is measured. The first observation signal and the second observation signal are limited to the observation frequency band and converted to a first signal of a first frequency and a second signal of a second frequency by frequency conversion based on a same reference frequency, respectively. A predetermined frequency difference is set between the first frequency and the second frequency. Then the first signal and the second signal are multiplied and a vector detection based on the reference frequency is performed for a difference frequency component between the two signals to obtain the phase information. An apparatus for measuring the correlation function based on the above method is disclosed. Further, a method and an apparatus wherein the correlation function measurement is performed to visualize a wave source image such as a sound source image and a radiowave source image based on the principle of holography is disclosed.
Advantest Corporation
Kim Robert
Nelms David C.
LandOfFree
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