Communications – electrical: acoustic wave systems and devices – Transmitter systems
Patent
1996-11-27
1998-05-19
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Transmitter systems
73589, 73597, 73599, 73602, 73624, G01N 2904
Patent
active
057544980
ABSTRACT:
A system for ultrasound transmission in materials 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 a group of fibers or leaf fragments wrapped in paper or others is placed in case 1, the ultrasound emitted from the ultrasonic transducer T.sub.s goes through the group of fibers or leaf fragments. Therefore, an output electric signal delivered from the ultrasonic transducer R.sub.s is decreased, causing a difference between the output electric signal delivered from the ultrasonic transducer R.sub.s and that delivered from the ultrasonic transducer R.sub.o. The difference is detected by the signal processing unit 3 and compared with that corresponding to a standard group of fibers or leaf fragments. Thus, a filling-density of the group of fibers or leaf fragments examined is evaluated.
REFERENCES:
patent: 4481820 (1984-11-01), Thomann
patent: 4581935 (1986-04-01), Breazeale
patent: 5348009 (1994-09-01), Ohtomo et al.
patent: 5665907 (1997-09-01), Sheen et al.
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