JP2931873B2 - Ultrasonic signal transmission device - 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 signal transmitting apparatus for transmitting a signal spatially with a digital signal using an ultrasonic wave, and more particularly to an ultrasonic signal transmitting apparatus for transmitting a signal in a limited space such as inside a pipeline. It concerns the device.

[0002]

2. Description of the Related Art Hitherto, as an application example of a method of transmitting a signal by facing two ultrasonic elements, remote controllers of various devices have been proposed.

[0003]

However, in this type of ultrasonic signal transmission device, since the ultrasonic waves are scattered in the air, the reception level sharply decreases as the distance increases. For this reason, the applicable range is limited to a relatively short distance.
On the other hand, there is a method to transmit containment ultrasound to prevent the ultrasound from being diffused into the conduit but, since it is necessary to insert the sensor into the conduit, due to the size constraints of the sensor However, it was difficult to use a high-output device, and it was difficult to increase the transmission distance.

Accordingly, it is an object of the present invention to provide an ultrasonic signal transmission device capable of extending a transmission distance.

In order to achieve such an object, a first invention according to the present invention provides a transmitting and receiving apparatus which always receives signals in a state where a receiving voltage level which fluctuates periodically with respect to a distance between transmitting and receiving signals becomes high. It is configured to move the position of the ultrasonic sensor or the receiving ultrasonic sensor. According to a second aspect of the present invention , in addition to the configuration of the first aspect, a plurality of transmitting ultrasonic elements having a diameter smaller than the inner diameter of the tube are arranged in series, and the ultrasonic waves generated from each element are transmitted through the tube. It has a horn configured to propagate to the inner periphery. Further, the third invention according to the present invention is an addition to the configuration of the first invention.
For example, it receives a signal transmitted from the transmitting ultrasonic transducer
Comprising a receiving credit ultrasonic element, a receiving circuit for demodulating the received signal amplified original signals, and transmitting ultrasonic transducer for transmitting the demodulated signal again, and composed repeater and a transmission circuit ing. Further, the fourth invention according to the present invention provides the first invention.
In addition to the configuration of the invention of the above, for transmission of a diameter smaller than the inner diameter of the tube
A plurality of ultrasonic elements are arranged in series, and from each element
Configured so that the generated ultrasonic wave propagates to the periphery inside the tube
Horn and signal sent from the transmitting ultrasonic element
A receiving ultrasonic element for receiving the signal, and amplifying the received signal.
The receiving circuit demodulates to the original signal and the demodulated signal is transmitted again.
Consisting of a transmitting ultrasonic element to transmit and a transmitting circuit
And a repeater.

[0006]

According to the first aspect of the present invention, a signal is always received at a position where the reception level fluctuates high. Therefore, it is possible to so limit the heat transmission distance is dependent on the minimum level in the higher reception level position, it is possible to extend the transmission distance. In the second invention, the transmission output can be increased by combining the outputs of the plurality of transmission ultrasonic sensors, and as a result, the transmission distance can be further increased. In the third aspect, the received signal is reproduced by the repeater into the original signal, and the original signal is transmitted again starting from the repeater. As a result, the transmission distance can be further increased. In the fourth invention, a plurality of transmission ultrasonic waves are provided.
Increasing the transmission output by synthesizing the sensor output
The received signal can be returned to the original signal by the repeater.
To transmit the original signal again starting from the repeater,
As a result, the transmission distance can be further increased.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing a configuration of an ultrasonic signal transmission device according to a first embodiment of the present invention. In the figure,
1 is a pipeline for containing ultrasonic waves, 2 is a transmitting ultrasonic element,
3 is a transmitting circuit, 4 is a receiving ultrasonic element, and 5 is a receiving circuit. The transmitting circuit 3 excites the transmitting ultrasonic element 2 by modulating the carrier with a signal wave at the frequency at which the output sound pressure level of the transmitting ultrasonic element 2 becomes the highest. The receiving circuit 5 amplifies and demodulates the signal received by the receiving ultrasonic element 4, and outputs the original signal. By the way, since an ultrasonic wave propagating in the air in the air generates a standing wave, the reception voltage level periodically varies with the distance between transmission and reception as shown in FIG. Normally, the transmission distance between transmission and reception is limited to a position where the minimum value of the reception voltage level is equal to or less than a certain threshold value. Therefore, if the signal is always received at the position of the maximum of the reception voltage level, the transmission distance can be extended to a position where the maximum value becomes equal to or less than a certain threshold value. Reference numeral 6 denotes a linear actuator, which moves the receiving ultrasonic element 4 in the axial direction of the tube within the range of the period L of the standing wave. Reference numeral 7 denotes a controller that determines the amount of movement of the receiving ultrasonic element 4 according to the distance between transmission and reception so that the receiving ultrasonic element 4 is always at the maximum position of the reception voltage level.

According to such a configuration, since the maximum value of the reception level is usually several times larger than the minimum value, the transmission distance can be considerably extended.

In this embodiment, the receiving ultrasonic element 4
Although the description has been given of the case in which is moved, the configuration in which the transmitting ultrasonic element 2 is moved is also possible.

FIG. 3 is a diagram showing a configuration of an ultrasonic signal transmission apparatus according to a second embodiment of the present invention, and the same parts as those in the above-mentioned figures are denoted by the same reference numerals. In FIG.
The difference is that the inner diameter of the transmitting ultrasonic element 2 is sufficiently smaller than the inner diameter of the conduit 1 and a plurality of ultrasonic elements are arranged in series in the axial direction. In addition, two transmission ultrasonic elements 2
Horns 8 each having a conical shape or a pyramid shape are coaxially arranged therebetween.

According to such a configuration, the ultrasonic waves transmitted from the transmission ultrasonic elements 2 disposed at the second and subsequent positions are transmitted to the peripheral portion of the pipeline by the horn 8, and the plurality of transmission ultrasonic elements 2 The outputs will be combined. As a result, the transmission output is dramatically increased, and the transmission distance can be extended. However, if the phases of the ultrasonic waves generated from the two transmitting ultrasonic elements 2 do not match, the result will be weakening. For this reason, the interval between the two transmitting ultrasonic elements 2 is set to a value that is an integral multiple of the wavelength and has a good phase.

Although not shown in FIG. 3, it is the same as FIG.
In this way, a configuration in which the linear actuator 6 and the controller 7 are combined is provided on the receiving side .

FIG. 4 is a diagram showing a third embodiment of the ultrasonic signal transmitting apparatus according to the present invention, and the same parts as those in the above-mentioned figures are denoted by the same reference numerals. In the figure, a different point from FIG. 1 is that a repeater 11 is arranged between a receiving side and a transmitting side in a pipeline 1 for containing an ultrasonic wave. This repeater 11
Is composed of a transmitting ultrasonic element 12, a transmitting circuit 13, a receiving ultrasonic element 14, and a receiving circuit 15.

According to such a configuration, the ultrasonic wave generated from the transmitting ultrasonic element 2 is once received by the receiving ultrasonic element 14 of the repeater 11. This signal is amplified by the receiving circuit 15 and demodulated to the original signal. The demodulated original signal is transmitted from the transmitting ultrasonic element 12 again through the transmitting circuit 13 and received by the receiving ultrasonic element 4. If such a repeater 11 is used, the starting point can be regarded as the repeater 11, and if the repeater 11 is arranged so that the distance between transmission and reception falls within the range of the transmission distance, the transmission distance becomes ,
It can be dramatically improved.

Although not shown in FIG. 4, it is the same as FIG.
In this way, a configuration in which the linear actuator 6 and the controller 7 are combined is provided on the receiving side . Multiple
It is needless to say that the same effect can be obtained by a configuration in which the transmitting ultrasonic element 2 and the horn 8 are combined.

The first, second, and third embodiments described above can be performed independently of each other, or can be combined as needed. is there.

[0017]

As described above, according to the present invention,
When a signal is transmitted wirelessly in a closed space in a pipeline, an extremely excellent effect that the transmission distance can be drastically extended can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of an ultrasonic signal transmission device according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a reception voltage level that fluctuates periodically.

FIG. 3 is a diagram illustrating a configuration of an ultrasonic signal transmission device according to a second embodiment of the present invention.

FIG. 4 is a diagram illustrating a configuration of an ultrasonic signal transmission device according to a third embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 conduit 2 transmitting ultrasonic element 3 transmitting circuit 4 receiving ultrasonic element 5 receiving circuit 6 linear actuator 7 controller 8 horn 11 repeater 12 transmitting ultrasonic element 13 transmitting circuit 14 receiving ultrasonic element 15 receiving circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) H04B 11/00 G01H 3/00

Claims (4)

(57) [Claims] 1. An ultrasonic signal transmitting device for transmitting a signal by inserting an ultrasonic element for transmission and an ultrasonic element for reception into opposite ends inside a tube, respectively, and transmitting an ultrasonic wave in the air in the tube. Transmitting ultrasonic element so as to always receive in a state where the receiving voltage level that fluctuates periodically with the distance between transmitting and receiving is high
And a moving means for moving any one position of the receiving ultrasonic element within the range of the period. 2. An ultrasonic signal transmitting apparatus for transmitting a signal by inserting a transmitting ultrasonic element and a receiving ultrasonic element facing each other at both ends inside a tube, and transmitting an ultrasonic wave in the tube in the air. A plurality of transmission ultrasonic elements having a diameter smaller than the tube inner diameter are arranged in series, and each transmission ultrasonic element is generated so that ultrasonic waves generated from each transmission ultrasonic element propagate to a peripheral portion inside the pipe. A horn is provided between the elements , and the reception voltage level that fluctuates periodically with the distance between transmission and reception.
Ultrasonic element for transmission so that the signal is always received when the bell is high
And the position of one of the receiving ultrasonic elements
An ultrasonic signal transmission device provided with moving means for moving within an area . 3. An ultrasonic element for transmission and an ultrasonic element for reception.
Into each end of the tube facing each other.
Ultrasonic signal transmission device that transmits signals by propagating sound waves in the air
In the device, between the transmitting ultrasonic element and the receiving ultrasonic element,
Reception to receive the signal sent from the transmitting ultrasonic element
Amplifying the received signal and demodulating it to the original signal
Receiving circuit to transmit the demodulated signal again
Providing a repeater composed of a sound wave element and a transmission circuit
In addition, the transmitting ultrasonic element so as to always receive in a state where the receiving voltage level that fluctuates periodically with the distance between transmitting and receiving is high.
And a moving means for moving any one position of the receiving ultrasonic element within the range of the period. 4. The pipe according to claim 3, wherein the diameter is smaller than the inner diameter of the pipe.
A plurality of transmitting ultrasonic elements of different diameters are arranged in series and
Ultrasonic waves generated from each transmitting ultrasonic element are transmitted inside the tube.
Each receiving ultrasonic element to propagate to the periphery of the
An ultrasonic signal transmission device comprising a horn therebetween.