JPS5918642B2 - Strange thing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a displacement position detection device that converts a mechanical displacement position into an electrical signal.

An object of the present invention is to realize a device of this type that has a simple structure and is not affected by changes in ambient temperature.

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

In the figure, 1 is a displacement object to which mechanical displacement is applied,
Here, it is constructed in the shape of a flat plate, and its surface is processed so that ultrasonic signals are reflected. 21 is an ultrasonic transmitter, and 22 is an ultrasonic receiver, which are arranged on one side of the displacement object 1 so that the ultrasonic signal is reflected by the displacement object 1 and the reflected waves can be received. There is.

23 is an electronic circuit including an amplifier and a pulse generation circuit.

Ultrasonic transmitter 21, ultrasonic receiver 22, and electronic circuit 2
3 receives a signal emitted from the ultrasonic transmitter 21 with the ultrasonic receiver 22, amplifies it, and again emits a new signal from the ultrasonic transmitter 21. 1 sink-around loop 20 is configured. 31
32 is an ultrasonic transmitter, and 32 is an ultrasonic receiver, which is connected to the other side of the displacement object 1, that is, the ultrasonic transmitter, so that the ultrasonic signal is reflected by the displacement object 1 and the reflected wave can be received. Wave device 2
1 and the ultrasonic receiver 22 are placed on the opposite side of the displacement object 1.

33 is an electronic circuit including an amplifier and a pulse generation circuit.

These ultrasonic transmitter 31, ultrasonic receiver 32, and electronic circuit 33 constitute a second sink-around loop 30 that operates in the same manner as described above. 4 is an arithmetic circuit which receives the sing-around frequency signal fl obtained from the first sink-around loop 20 and the sink-around frequency signal f2 obtained from the second sink-around loop 30 as input signals.

5 is an output terminal.

The operation of the apparatus configured in this way will be explained next. now,
If the ultrasonic transmitters 21 and 31 and the ultrasonic receivers 22 and 32 are arranged side by side at the same distance from the reflective surface of the displacement object 1, and the distances to the reflective surface are D and 3D2, then , a sync-around frequency f1 obtained from the first sync-around loop 20 and a sync-around frequency F2 obtained from the second sync-around loop 30.
can be expressed by equations (1) and (2). However, C is the propagation speed DO of the ultrasonic signal (DlH)2, which is a constant value regardless of the displacement position of the displaced object 1.

The arithmetic circuit 4 receives F,, f2 as input signals, and here, for example. 12 operations are performed.

That is, f1+F2 By performing such an operation, equation (3) can be obtained from equations (1) and (2).

In equation (3), since DO is a constant value, the output of the arithmetic circuit 4 corresponds to D1, and from this the amount of displacement of the displacement object 1 can be determined.

The advantage of expressing the calculation result in a form like equation (3) is that the term for the sound propagation velocity C does not exist in equation (3), and the propagation time can be changed due to temperature changes, etc. The point is that it is not affected by changes in the FIG. 2 is a block diagram when the present invention is applied to an automatic balance meter.

In the figure, a displacement object 1 is attached to a recording pointer 11 and corresponds to the movement of this recording pointer 11. Reference numeral 6 denotes a frequency signal/voltage signal converter, which generates a feedback signal Ef corresponding to the displacement position of the displacement object 1 at its output end.

Reference numeral 7 designates a comparator amplifier, to which an input signal Ei is applied to one input terminal, a feedback signal Ef is applied to the other input terminal, and the displacement object L is outputted via a balanced motor 8 so that ET becomes equal to Ei. move.

Reference numeral 81 denotes a guide screw, which is rotated by a balance motor 8 so that the displacement object 1 moves together with the recording pointer. As a result, the recording pointer 11 is balanced at a position corresponding to the input signal Ei. FIG. 3 is a configuration diagram showing another example of application of the present invention.

Here, the displacement of the diaphragm 11 is detected using the same principle. That is, the diaphragm 11 absorbs the pressures P, , P applied to the chambers 91 and 92 provided on both sides of the diaphragm 11.
2, for example, as shown by the dotted line, and this amount of displacement is detected as a change in the frequency signal. In addition, in the above embodiment, the arithmetic circuit 4 inputs the frequency signal,
−” 1− operation is performed 'F, +f! Although the explanation has been made regarding the combination of f, it is also possible to perform the operation equal to 1 and obtain a signal corresponding to ``Sekioh RD.''.

Alternatively, the calculation may be performed using analog signals corresponding to F,, f2. As described above, according to the present invention, it is possible to realize a displacement position detection device that is not affected by changes in ambient temperature and has a simple structure.

Also - according to the invention, mechanical displacement? Since there is no need to attach electrical parts or connect lead wires to the given displacement object, the weight of the displacement object portion can be reduced and reliability can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a block diagram when the present invention is applied to an automatic balancing instrument, and FIG. 3 is a block diagram showing another example of application of the present invention. . 1... Displaced object, 21, 31... Ultrasonic wave transmitter, 22, 32... Ultrasonic wave receiver, 23
,33...electronic circuit,20,30...
Sink-around loop, 4... Arithmetic circuit.

Claims (1)

[Claims] 1. A displacement object that is mechanically displaced and configured so that both surfaces reflect ultrasound signals, and both surfaces of this displacement object serve as reflection surfaces for ultrasound signals, and ultrasound signals are formed on both sides of the displacement object. two sets of an ultrasonic transmitter and an ultrasonic receiver fixedly arranged via the propagation path of the object; two sets including the ultrasonic transmitter and the ultrasonic receiver formed on both sides of the displacement object; input the two types of sing-around frequency signals f_1 and f_2 obtained from these two sets of sing-around loops,
A displacement position detection device comprising an arithmetic circuit that obtains a signal corresponding to the displacement of the displacement object by performing an arithmetic operation of _2 or f_2/f_1+f_2.