Object detecting system using ultrasonic waves

• US 4,882,714 A
• Filed: 01/07/1988
• Issued: 11/21/1989
• Est. Priority Date: 02/07/1984
• Status: Expired due to Term

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Tanigawa, Hiroshi
• Primary Examiner(s): Tarcza, Thomas H.
• Assistant Examiner(s): Pihulic, Daniel T.
• Application Number:
  US07/143,289
• Time in Patent Office: 684 Days
• Field of Search: 367/103, 367/105, 367/138, 73/626
• US Class Current: 367/103
• CPC Class Codes: G01S 15/02 using reflection of acoustic waves G01S15/66 takes precedence
• CPC Class Codes: G01S 15/06 Systems determining the position data of a target
• CPC Class Codes: G01S 15/42 Simultaneous measurement of distance and other co-ordinates indirect measurement G01S15/46

Abstract

An ultrasonic wave sensor wherein the transmitter and receiver include a linear array of transducers. Each of the transducers of the transmitter are driven by plural pulsed signals in each of a plurality of intermittent time periods. The timing of the pulsed signals to each of the transducers is controlled to produce wave fronts that interfere to produce combined wave fronts at angles to the array of transducers. Three-phase charge coupled devices in conjunction with three-phase clocking pulses are used to produce pulsed signals of predetermined delays to each of the transducers. The receiver uses three-phase charge coupled devices and three-phase clocking pulses to process returned signals.

Claims

1. An object detecting system comprising:

an ultrasonic element array comprising a plurality of ultrasonic transducer elements;

means for intermittently supplying burst driving pulses to said ultrasonic transducder elements at different times in each of successive intermittent periods, said means for intermittently supplying burst driving pulses comprising;

driving pulsers for said ultrasonic transducer elements, respectively, each driving pulser comprising first and second delay circuits in parallel, said first and second delay circuits having controllable delays;

means for supplying a sequence of pulse bursts to the first and the second delay circuits of said driving pulsers to make the first and the second delay circuits of said driving pulsers produce said burst driving pulses with said different times determined by the controllable delays of the first and the second delay circuits of said driving pulsers in each of said successive intermittent periods; and

means for delivering said burst driving pulses from the first and the second delay circuits of said driving pulsers to said ultrasonic transducer elements, said means for delivering said burst driving pulses comprising;

adding means for adding the burst driving pulses of the first and the second delay circuits of said driving pulsers with the burst driving pulses of the first and the second delay circuits of each driving pulser arranged as a driving burst succession of two driving bursts in response to each of said pulse bursts at a time interval dependent on said different times in each of said successive intermittent periods; and

means for supplying said ultrasonic transducer elements with the driving burst successions into which the burst driving pulses of the first and the second delay circuits of said driving pulsers are added in response to each of said pulse bursts in each of said successive intermittent periods; and

means for controlling time relationships between said different times in said successive intermittent periods,

said means for controlling time relationships controlling the controllable delays of the first and the second delay circuits of said driving pulsers in said successive intermittent periods.