JPS609738Y2 - distance measuring device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a non-contact distance measuring device.

Traditionally, this type of device has consisted of a transmitter that emits waves containing time information of the human skin wavelength, a receiver that receives echoes from the target to be ranged and demodulates the time information, and a receiver that receives the echoes from the target object to be ranged and demodulates the time information. The device is composed of a processor that generates an output corresponding to the distance from the time difference between the time information given to the transmitted wave and the time information given to the transmitted wave.

However, in such conventional devices, the relationship between the wavelength human milk included in the time information and the wavelength λC of the carrier wave is λc<
λm, and since the distance is measured using human milk with a large wavelength, it has the disadvantage of poor distance resolution.

In order to solve the above-mentioned drawbacks, the present invention includes a transmitter that temporally increases or decreases the frequency of a transmitted wave, a receiver that receives an echo from a target to be measured and outputs the phase of the local wave, and The objective of the present invention is to obtain excellent distance resolution by integrating a controller that integrates the frequency of the transmitting wave and, when a set value is reached, switches the tendency of the frequency of the transmitted wave to increase or decrease.

Embodiments of the present invention shown in the drawings will be described below.

In FIG. 1, 1 is a transmitter that emits a microwave wave 9 whose frequency changes over time in a triangular wave pattern, and 2 is a transmitter that receives the echo of the wave 9 from a target 4 to be measured. a receiver that outputs the phase with the local wave 6 from 1;
3 integrates the output (phase signal 7) of the receiver 2 and transmits it to the transmitter 1.
It is a controller that controls the received wave (echo), and 5 is the received wave (echo).
, 8a, 8b are control signals from the controller 3.

The operation of the above configuration will be explained with reference to the waveform diagram shown in FIG.

A microwave wave 9 transmitted at a certain frequency 10 (FIG. 2a) from the transmitter 1 is reflected by the object 4 to be measured and received by the receiver 2.

The receiver 2 detects the phase of the received wave 5 and the local wave 6 from the transmitter 1 and sends a phase signal 7 (FIG. 2b) to the controller 3.

The controller 3 integrates the phase signal 7 over time and sends control signals 8a, 8b (FIG. 2d) to the transmitter 1.

Now, when the frequency 10 of the wave 9 from the transmitter 1 is increasing, the controller 3 determines whether the integral amount 13 [FIG. 2C] is 2? r
When the frequency 10 of the wave 9 is reached, a control signal 8a that reduces the frequency 10 of the wave 9 is started to be sent to the transmitter 1, and the integration of the next cycle is started.

Similarly, when the frequency 10 of the wave 9 from the transmitter 1 is decreasing, the controller 3 starts sending the control signal 8b to the transmitter 1 to increase the frequency 10 of the wave 9 and integrates the next cycle. Start.

This closed-loop operation causes the carrier wave frequency 11 [second
Figure a] and the average value 12 of the control signals 8a and 8b [Figure 2 d
] takes a value corresponding to the distance to the distance measurement target 4.

Hence said control signal 8a. The distance information to the target object 4 to be measured can be obtained from the average value 12 of 8b.

Note that in this embodiment, the phase integral amount 13 is 2? Although the control signals 8a and 8b are switched at the time when r is reached, the control signals 8a and 8b are switched, but 4? Of course, the same effect can be obtained by setting r or any other arbitrary setting value, and the transmitted wave is not limited to microwave waves, but may also be acoustic waves or optical waves. It goes without saying that the same effect can be obtained by using .

As described above, the device of the present invention includes a transmitter that temporally increases or decreases the frequency of the transmitted wave, a receiver that receives the echo from the object to be ranged and outputs the phase of the local wave.
Since it is composed of a controller that integrates the phase and switches the tendency of increase/decrease in the frequency of the transmitted wave when the set value is reached, it is possible to obtain a distance resolution of approximately 1/W of the wavelength of the carrier wave. This has an excellent effect.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing one embodiment of the device of the present invention;
Figures a to d are waveform diagrams for explaining the operation of the device of the present invention. 1...Transmitter, 2...Receiver, 3...
...Controller, 4...Target to be measured, 5...
...Received wave, 6...Local wave, 7.
...Phase signals from receiver 2, 8a, 8b...
... Control signal from controller 3, 9... Transmission wave.

Claims (1)

[Scope of utility model registration request] A transmitter that increases or decreases the frequency of the transmitted wave over time, a receiver that receives the echo from the object to be ranged and outputs the phase with the local wave, and integrates the phase and, when it reaches a set value, transmits the wave. 1. A distance measuring device comprising: a controller that switches an amplification tendency of a wave frequency.