Measuring and testing – Vibration – By mechanical waves
Patent
1984-01-27
1985-08-13
Kreitman, Stephen A.
Measuring and testing
Vibration
By mechanical waves
73602, G01N 2900
Patent
active
045342202
ABSTRACT:
The present invention relates to an apparatus which determines the distribution of the attenuation slope coefficient on a real time basis using the center frequency shift. The phase difference between a received signal and a reference signal is determined using EXCLUSIVE OR gates or an inverse trigonometric relation stored in a ROM. The phase difference is input to a differentiator which outputs the center frequency shift of the received signal on a real time basis. The center frequency shift is input to another differentiator which outputs the attenuation slope coefficient. Thus, the attenuation slope coefficient is determined using simple hardware and without calculating the power spectrum and the first moment.
REFERENCES:
patent: 4202215 (1980-05-01), Heyer
patent: 4414850 (1983-11-01), Miwa et al.
Klepper John R.
Miwa Hirohide
Murakami Keiichi
Reid John M.
Shimura Takaki
LandOfFree
Apparatus for measuring the characteristics of an ultrasonic wav does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for measuring the characteristics of an ultrasonic wav, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for measuring the characteristics of an ultrasonic wav will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2311866