JP2758725B2 - Ultrasonic detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic detecting apparatus for detecting an object using ultrasonic pulses.

[0002]

2. Description of the Related Art An ultrasonic detector that transmits an ultrasonic pulse, detects a reflected wave from an object, and detects the presence or absence of the object,
Conventionally, a noise monitoring section is temporally provided to prevent erroneous detection due to noise such as city area noise. conventionally,
As shown in FIG. 3, a plurality of ultrasonic detectors (FIG.
When using the four ultrasonic detectors of (d)), 4
Since the two ultrasonic detectors were operated at the same time, the noise monitoring section 3 after the transmission and reverberation waveform 1 and the reception detection time 2
Was able to secure Tn.

[0003]

However, in order to reduce the number of parts, when each of the ultrasonic detectors is operated by scanning in which the ultrasonic detectors are sequentially driven independently, as shown in FIG. Since the same response time T is required, the noise monitoring section 3 naturally becomes short to Tn ', and there is a problem that the noise monitoring capability is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has been made in consideration of the above-described problems. Therefore, even when a plurality of ultrasonic detectors are operated by scanning in which each of the ultrasonic detectors is sequentially driven independently, an ultrasonic detection capability capable of ensuring noise monitoring capability can be ensured. It is intended to provide a device.

[0005]

SUMMARY OF THE INVENTION According to the present invention, an ultrasonic pulse is transmitted, a reflected wave from an object is detected to detect the presence or absence of the object, and a ratio of noise occupying the noise monitoring section is detected. In the ultrasonic detection device that operates in a scanning manner in which a plurality of ultrasonic detectors are provided and each ultrasonic detector is sequentially driven independently, the ultrasonic detection in which the ratio of noise occupying a noise monitoring section exceeds a preset value. It has a control unit for fixing the circuit system exclusively by removing the device from the scanning method.

[0006]

[Operation] By the control unit, the ultrasonic detector in which the ratio of the noise occupying the noise monitoring section exceeds a preset value is removed from the scanning method so that the circuit system is exclusively fixed, and The noise monitoring section is secured while maintaining the same response time as when operating.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of the entire apparatus, and this embodiment shows a case where four ultrasonic detectors are configured.
Note that the number of ultrasonic detectors is not limited to four. First, the transmission pulse generation unit 12 in the control unit 11 sends the transmission control unit 13
Ultrasonic pulses are transmit the ultrasonic vibrator ₄₁ to ₄ via the transmitting unit 5 ₁ to 5 ₄ selected by the switching unit 7 by.

The reflected wave from the object is the ultrasonic vibrator 4₁~ 4
_FourThe signal is received by the₁~ 6_FourAfter amplification in
The ultrasonic detector selected by the switching unit 8 by the wave control unit 14
Receiving and detecting unit 9₁, 9_Two, Receiving wave shaping unit 10₁,
10_TwoThe waveform is shaped by the₁, 15
_TwoThen, the ratio of noise within a certain period of time is calculated. This
Here, the ratio of the noise monitoring section 3 in FIG.
Receiving ratio detector 15 ₁, 15_TwoThe value calculated in
When the value exceeds the specified value, as shown in FIG.
Receiving detector 9 in the ultrasonic detector₁, Receiving wave shaping unit 10₁To
By fixing, the noise monitoring section 3 is set to Tn 'shown in FIG.
To Tn shown in FIG.
I keep it.

On the other hand, the remaining ultrasonic detector is shown in FIG.
(C) As shown in (d), the reception detection unit 9 _Two, Receiving wave shaping unit 1
0_TwoBy operating with the scanning method using
Securing the noise monitoring section 3 while maintaining the response time T
Can be done.

[0010]

As described above, the present invention transmits an ultrasonic pulse, detects a reflected wave from an object, detects the presence or absence of the object, and detects the ratio of noise occupying the noise monitoring section. In the ultrasonic detection device that operates in a scanning manner in which a plurality of ultrasonic detectors are provided and each ultrasonic detector is sequentially driven independently, the ultrasonic detection in which the ratio of noise occupying a noise monitoring section exceeds a preset value. It has a control unit that removes the detector from the scanning method and fixes the circuit system exclusively.Therefore, the control unit allows the ultrasonic detector whose noise occupying ratio in the noise monitoring section exceeds a preset value. By removing the scanning system and fixing the circuit system exclusively, it is possible to secure the noise monitoring section while maintaining the same response time as when operating simultaneously. .

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is an operation waveform diagram.

FIG. 3 is an operation waveform diagram of a conventional example.

FIG. 4 is an operation waveform diagram in the case of a conventional scanning method.

[Explanation of symbols]

 11 Control part

Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) G01S 3/80-3/86 G01S 5/18-5/30 G01S 7/52-7/66 G01S 15/00-15 / 96

Claims (1)

(57) [Claims] A plurality of ultrasonic detectors for transmitting an ultrasonic pulse, detecting a reflected wave from an object to detect the presence or absence of the object, and detecting a ratio of noise occupying in a noise monitoring section; In the ultrasonic detection device that operates by the scanning method in which each ultrasonic detector is sequentially driven independently, the ultrasonic detector in which the ratio of the noise occupying the noise monitoring section exceeds a preset value is removed from the scanning method and is used exclusively. An ultrasonic detection device, further comprising a control unit for fixing a circuit system.