JPS63284483A - Distance measuring instrument - Google Patents

Abstract

PURPOSE:To measure the distance between two points without utilizing any reflected wave by finding the distance between the two points according to the difference in time required for transmission between two kinds of signals which differ in transmission speed. CONSTITUTION:A transmitter 1 is equipped with a radio wave transmission part 1a which sends a radio wave and an acoustic wave transmission part 1b which sends an ultrasonic wave, and radiates the radio wave and ultrasonic waves at the same time. A receiver 2 inputs the outputs of a radio wave receiving circuit 5 and an acoustic wave receiving circuit 6 to a time difference detecting circuit 7, generates a start signal when the output level of the circuit 5 becomes L, and generates a stop signal when the output level of the circuit 6 becomes L. Here, the radio wave has a speed about 10<6> times as fast as that of the ultrasonic wave, so the time from the stop of the radio wave to the detection on the side of the receiver 2 is found on the side of the transmitter 1 and the distance between the transmitter and receiver 2 is found by considering the propagation speed of the ultrasonic speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 1] The present invention relates to a distance measuring device that measures the distance between two points.

[Background technology] Generally, when measuring the distance between two points, a reflector is placed opposite a light beam generator that emits a light beam with good straightness, such as a laser beam, and the reflected light is emitted in accordance with the distance to the reflector. A triangulation-type measuring device that measures the deviation of the light receiving position of the object to determine the distance to the reflecting mirror, and a triangulation-type measurement device that measures the distance to the reflecting mirror by measuring the deviation of the light receiving position of the object, and a triangulation-type measurement device that measures the distance to the reflecting mirror by reflecting the sound wave such as a sound wave from a target object. Measuring devices have been devised that measure the distance to a target object based on time. By the way, if you want to know the distance that a weight flew when fishing, you need to find the distance at the moment the weight sank into the water, but you can do the measurement as described above! If! Since F uses the reflection of a light beam or sound wave, it is difficult to obtain the reflected wave at that moment, and it cannot be used for this type of purpose.

[Objective of the Invention 1 The present invention has been made in view of the above points, and its object is to provide a distance measuring device that can measure the distance between two points without using reflected waves. Our goal is to provide the following.

[Disclosure of the Invention] (Structure) Fill! according to the present invention! The measuring device includes a transmitting means for simultaneously transmitting two types of signals with different transmission speeds, and a receiving means for receiving both signals, the transmitting means changes both signals at the same time, and the receiving means changes the two signals at different transmission speeds. It is equipped with a calculation means for calculating the distance to the transmitter based on the time difference between detecting the change point of the faster signal and detecting the change point of the slower signal. 2 based on the difference in time required to transmit two types of signals with different speeds.
The distance between points is determined without using reflected waves.

(Example) This example shows an example in which a transmitter that emits ultrasonic waves and radio waves simultaneously into the air is provided, but the present invention is not limited to this.

As shown in FIG. 1, a transmitter 1 and a receiver 2 are provided. The transmitter 1 includes a radio wave transmitter 1a that transmits radio waves of 500 AHZ or higher, and a sonic wave transmitter 6 lb that transmits ultrasonic waves of 40 AHZ or higher, and emits radio waves and ultrasonic waves into the air at the same time. This transmitter 1 may be provided, for example, in a fishing weight, in the tip of a spear used in javelin throwing, or in a ball. When installed inside a fishing weight, when the weight sinks into the water, radio waves and ultrasonic waves are no longer propagated at the same time, and the receiver 2
Therefore, if the spear is to be loaded into a spear, a switch should be installed at the tip of the spear to stop emitting radio waves and ultrasonic waves when it collides with the ground. Even when the vehicle is being delivered, a switch may be provided to stop the emission of radio waves and ultrasonic waves when it catches or collides with the ground.

The receiver 2 includes an antenna 3 that receives radio waves and a transfer device 4 that transfers ultrasonic waves. 7 The antenna 3 is connected to the radio wave receiving circuit 5, and the delivery device 4 is connected to the sound wave receiving circuit 6. As shown in @2 Figures (a) and (b), the radio wave receiving circuit 5 and the sound wave receiving circuit 6 The output level is set to ``H'' during the period when input is obtained, and when the input is no longer obtained, the output level is set to ``L'' to obtain a binary output. The outputs of the radio wave receiving circuit 5 and the sound wave receiving circuit 6 are input to the time difference detection circuit 7, and as shown in FIG. 2(, e), when the output level of the radio wave receiving circuit 5 becomes L, a start signal is generated. The output level of the sound wave receiving circuit 6 is “
When the signal reaches "L", a stop signal is generated.Since radio waves have a speed approximately 106 times that of ultrasonic waves, the transmission speed is approximately 106 times that of ultrasonic waves. The time from when the radio waves stop at 1gA until it is detected on the receiver 2 side can be considered to be essentially 0, so from that time until the stop of the ultrasonic wave is detected on the receiver 2 side. The distance between the transmitter 1 and the receiver 2 can be determined by calculating the time and considering the propagation speed of the ultrasonic wave.

For example, if the outside temperature is 15℃, the speed of sound is 340℃.
Since it is x7 sec, if the time difference between the stop of the radio wave and the stop of the ultrasonic wave is t, the distance to the transmitter 1 can be found as 340 x t. However, as shown in FIG. 2(d), the reference pulse generating circuit 8 generates pulses with a constant period, and the number of pulses in the period from the start signal to the stop signal (FIG. 2(e)) If the number of pulses is counted by the counter 9, the distance can be determined by the number of pulses. The pulse generation period is, for example, 3xsee
If set to , one pulse corresponds to approximately 111. The distance determined in this way is displayed on the display 10. Here, if a more accurate distance is to be determined, temperature correction may be performed.Also, the time difference detection circuit 7, reference pulse generation circuit 8, counter 9, etc. described above may be configured individually, but the microcomputer It may also be configured by

In the above-mentioned embodiment, the time when the counter 9 starts counting is the time when the radio wave is received, but depending on the object to be measured, light may be used, and when used in a noisy place, light may be used instead of propagating through the air. The information may be transmitted through a transmission path such as a conducting wire.

Furthermore, when using a transmission path, it is not necessary to use radio waves, and a simple electrical signal may be used. Furthermore, for light, an optical fiber may be used as the transmission path. Further, in the above example, the radio waves and ultrasonic waves are stopped, but the state may be changed other than stopping, such as by changing the frequency. In addition to the combination of signals such as radio waves and light whose propagation speed can be regarded as substantially O and signals such as sound waves, it is also possible to combine signals that have different speeds and have a time difference related to distance. For example, it goes without saying that the technical concept of the present invention C can be applied.

[Effects of the Invention] As described above, the present invention includes a transmitting means for simultaneously transmitting two types of signals having different transmission speeds, and a receiving means for receiving both signals, and the transmitting means transmits both signals at the same time. and the receiving means calculates the distance to the transmitter based on the time difference between detecting the change point of the signal with the faster transmission speed and detecting the change point of the signal with the slower transmission speed. Since the distance between two points is determined based on the difference in time required for transmission of two types of signals with different transmission speeds, distance can be measured without using reflected waves. As a result, it has the advantage of being able to measure distances for special purposes that could not be measured with conventional distance measuring devices, such as the distance of a weight in fishing or the distance of a ball in throwing a ball.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the same operation. 1 is a transmitter, 2 is a receiver, 7 is a time difference detection circuit, 8 is a reference pulse generation circuit, 9 is a counter, and 10 is a display. Agent Patent Attorney Ishi 1) Ai Shichiichi Kokutsu

Claims (3)

[Claims] (1) It has a transmitting means that simultaneously transmits two types of signals with different transmission speeds, and a receiving means that receives both signals, where the transmitting means changes both signals at the same time, and the receiving means has a high transmission speed. The distance transmitter is characterized by comprising calculation means for calculating the distance to the transmitter based on the time difference between detecting the time point of change of the signal having a lower transmission speed and detecting the time point of change of the signal having a slower transmission speed. measuring device. (2) The distance measuring device according to claim 1, wherein the transmitting means simultaneously emits sound waves and electromagnetic waves into the air. (3) The transmitting means emits sound waves into the air, and
The distance measuring device according to claim 1, characterized in that the electromagnetic wave is transmitted through a transmission line interposed between the transmitting means and the receiving means.