Measuring and testing – Vibration – By mechanical waves
Patent
1996-11-27
1999-07-13
Brock, Michael
Measuring and testing
Vibration
By mechanical waves
73599, 73159, 73 186, G01N 2908, G01N 2926
Patent
active
059229608
ABSTRACT:
An ultrasonic material constant measuring system comprising a reference unit, an examination unit, at least a case equipped in at least the examination unit, and a signal processing unit. The reference unit consists of at least an input ultrasonic transducer T.sub.o and at least an output ultrasonic transducer R.sub.o. The examination unit consists of at least an input ultrasonic transducer T.sub.s and at least an output ultrasonic transducer R.sub.s. The case is placed between the ultrasonic transducers T.sub.s and R.sub.s. The signal processing unit is connected with output terminals of the ultrasonic transducers R.sub.o and R.sub.s. When electric signals are applied to the ultrasonic transducers T.sub.o and T.sub.s, ultrasounds are emitted in air from the ultrasonic transducers T.sub.o and T.sub.s, respectively, and then received by the ultrasonic transducers R.sub.o and R.sub.s, respectively. If at least a sheet of paper is placed in case 1, the ultrasound emitted from ultrasonic transducer T.sub.s goes through the sheet of paper. Therefore, an output electric signal delivered from ultrasonic transducer R.sub.s is decreased, causing a difference between the output electric signal delivered from ultrasonic transducer R.sub.s and that delivered from ultrasonic transducer R.sub.o. The difference is detected by signal processing unit 3 and compared with that corresponding to a standard paper. Thus, the thickness of the paper examined, or the number of sheets of the paper examined is evaluated.
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Brock Michael
Miller Rose M.
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