The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 24, 1999
Filed:
Sep. 08, 1997
Tomonori Kimura, Kanagawa, JP;
Shusou Wadaka, Kanagawa, JP;
Koichiro Misu, Kanagawa, JP;
Tsutomu Nagatsuka, Kanagawa, JP;
Mitsuhiro Koike, Kanagawa, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A detecting device for detecting a physical quantity of an object, which includes a transmission signals generating device for generating first and second transmission signals of different frequencies, an ultrasonic wave transmission device that is excited by the first and the second transmission signal, for transmitting ultrasonic pulses corresponding to the first and the second transmission signal to an object, and a signal processing device for carrying out a signal processing process on the first and the second echo. The signal processing process is such that it detects phases of the first and second echo corresponding to the first and second transmission signal, which are received by the ultrasonic wave receiving device. An indeterminacy integer times as large as 2.pi. of the phase of each of the first and second echo is determined on the basis of the information of the amplitudes of the first or the second echo, and a distance from the ultrasonic wave transmission device through an object to the ultrasonic wave receiving device along an ultrasonic wave propagating path is detected on the basis of the determined phase of the first or second echo.