KR970048608A - Ultrasonic distance measuring device using excitation pulse reversal phase generator - Google Patents

Abstract

The present invention relates to an ultrasonic distance measuring device using an excitation pulse reversal phase generator, and to reduce reverberation sound, which is a characteristic of an ultrasonic sensor, by using an excitation pulse reversal phase memory and an excitation pulse reversal phase generator, to at least reduce the measurement range. In addition, the maximum detection distance can be increased, and the reverberation sound can be eliminated when the excitation pulse and the ultrasonic wave are received so that the distance can be measured during the time when the reverberation sound is present, thereby reducing the minimum detection distance and increasing the maximum detection distance. The present invention can be applied to a distance measuring field, an object sensing field, and an automobile collision avoidance field.

Description

Ultrasonic distance measuring device using excitation pulse reversal phase generator

As this is a public information case, the full text was not included.

2 is an overall configuration diagram of the present invention.

4 is a timing diagram of an inverted phase pulse generator driving signal of the present invention.

Claims (3)

In the ultrasonic distance measuring apparatus, ultrasonic waves are provided to the object object 31 through the ultrasonic driving circuit unit 20 and the ultrasonic transmitting sensor 30, and the object object 31 is detected through the ultrasonic sensor 50. After filtering by the band filter unit 60, the amplification unit (70, 80, 90) is amplified and detected and the amplification unit (70, 80, 90) and the ultrasonic drive circuit 20 is controlled by the central processing unit (10) In the ultrasonic distance measuring device, an inversion phase is generated by applying an excitation signal inversion phase to the ultrasonic transmission sensor 30, receiving an ultrasonic transmission sensor 30, and controlling the excitation signal inversion phase under the control of the central processing unit 10. Ultrasonic distance measuring apparatus using the excitation pulse inversion phase generating means, characterized in that the addition portion 40. An ultrasonic distance measuring method comprising: a first step (S1) of initializing a variable by starting first; A second step (S2) of driving the ultrasonic transmitting sensor by an ultrasonic driving circuit by driving the transmitting pulse to drive the ultrasonic transmitting sensor after performing the first step (S1); A third step (S3) of switching the excitation pulse inversion phase recording device to drive the excitation pulse after the second step (S2); A fourth step S4 of measuring a distance according to a predetermined measurement time by switching to a distance measurement mode after performing the third step S3; A fifth step S5 of converting time data into distance data by switching to a distance calculation mode after performing the fourth step S4; After performing the fifth step S5, the apparatus switches to the distance display mode and transmits the calculated distance data and the alarm condition to the display unit, and then sequentially returns to the distance measurement mode step of measuring the distance. Ultrasonic distance measuring method using an excitation pulse inversion phase generating means characterized in that. 3. The method of claim 4, wherein the distance measuring mode of the fourth step S4 is performed by driving an outgoing pulse to drive the ultrasonic outgoing sensor to drive the ultrasonic outgoing sensor by the ultrasonic driving circuit (S4-1). )Wow; Step 4-2 (S4-2) of driving the excitation pulse reversal phase generation after the step 4-1 (S4-1); Step 4-3 (S4-3) of adjusting the amplification ratios of the 1,2-stage variable amplifying circuit unit and the variable gain bandpass filter unit, which are amplified by the control signal after performing step 4-2 (S4-2). Wow; After performing step 4-3 (S4-3), it is determined whether the reverberation sound is present or not. If it is determined that the reverberation sound is not present, the control signal is adjusted to obtain a maximum amplification rate. Step S4-4; If it is determined that the reverberation sound is present after performing the step 4-4 (S4-4), or determines whether or not the distance measurement time is exceeded after performing the step 4-4 (S4-4), If it is determined that the distance measurement mode has been exceeded, step 4-5 (S4-5) for exiting the distance measurement mode and executing the next mode; and if the distance measurement time has not been exceeded after performing step 4-5 (S4-5) If the comparison output signal of the comparator is high or not, and if it is determined that it is not, the operation is sequentially performed in steps 4-6 (S4-6) in which the distance measuring mode is terminated and the next mode is executed. Sound wave distance measuring method using an excitation pulse reversal phase generator, characterized in that. ※ Note: The disclosure is based on the initial application.