JPS63313069A - Method for detecting moving state of moving body - Google Patents

Abstract

PURPOSE:To easily detect the moving state of a moving body to be detected, i.e. whether the moving body moves forth or back, or is accelerated or decelerated by arranging a couple of light receiving elements at a constant interval in a direction parallel to the movement path of the moving body, and detecting the moving body sideward. CONSTITUTION:The couples 1 and 2 of light receiving elements 4 and 5, and 6 and 7 which are provided successively are arranged at the constant interval in parallel to the movement path of the moving body 3 to be detected. The optical system consisting of a light emitting element 8 and a lens 9 for forming images of the moving body 3 on the light reception surfaces of the light receiving elements 1 and 2 is arranged between the movement path of the moving body 3 and light receiving element couples 1 and 2. Then monostable circuits are triggered with the difference signal between the outputs of the light receiving element couples 1 and 2 and the moving direction, acceleration/deceleration state, or speed of the moving body 3 is detected from whether or not the output signals of the monostable circuits match with each other, the polarity or part of the matching or mismatching part and the interval between the light receiving element couples 1 and 2.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the moving state of a moving object, that is, its moving direction,
The present invention relates to a method of detecting one of the following: increase/deceleration and speed without contact.

Conventional Techniques Conventional methods for non-contact detection of the moving direction, increase/deceleration, or speed of a moving object include emitting ultrasonic waves or radio waves toward a non-detectable object, such as a vehicle, and emitting reflected waves from the waves. It utilized the frequency change of , that is, Doppler hardening.

Problems to be Solved by the Invention However, in such a method, it is necessary to radiate ultrasonic waves or radio waves in the moving direction of the object to be detected, and there are significant restrictions in implementing this method.

The present invention aims to provide a method in which the practical limitations of such conventional methods are significantly alleviated.

Means for Solving the Problems The method of the present invention includes first and second light receiving elements each having a pair of light receiving elements arranged parallel to each other in a direction parallel to the movement path of a moving object to be detected. The second pair of light receiving elements are arranged at a constant interval in the juxtaposition direction, and the second pair of light receiving elements is arranged along the movement path of the moving object to be detected.
The image of the moving object to be detected is placed between the first pair of light receiving elements and the second pair of light receiving elements.
．． An optical device that forms an image on the light-receiving surface of the second pair of light-receiving elements is disposed, and a difference signal between the outputs of the first and second pairs of light-receiving elements is used to form the first . The second monostable circuit is triggered, and the output signals of the first and second monostable circuits are matched, mismatched, or the polarity of the mismatched portion, or match, mismatched portion, and the first . Based on the distance between the second pair of light receiving elements, the moving direction of the moving object to be detected, or the increase/deceleration,
Or it is characterized by detecting speed.

Since the direction of movement of the object to be detected is optically detected, the detection is performed from the side of the object to be detected, so that restrictions on implementation are reduced.

EXAMPLE A method according to an example of the present invention will be described below with reference to the drawings.

FIG. 1 is a conceptual diagram of an apparatus for carrying out this embodiment.

In the figure, reference numerals 1 and 2 indicate a pair of light receiving elements, in which light receiving elements 4, 5, 6, and 7 are arranged side by side along the movement path of the object to be detected 3, and these light receiving element pairs 1 and 2 are arranged at a constant rate. They are arranged horizontally at intervals. Light receiving element 4~
For example, a photodiode can be used for 7. Reference numeral 8 denotes a light emitting element, which is located on the same side as the pair of light receiving elements 1 and 2 with respect to the movement path of the detected object 3, and is located on the same side as the detected object 3.
It is arranged to emit light towards. Light emitting element 8
For example, light emitting diodes can be used. A lens 9 is arranged in front of the pair of light receiving elements 1 and 2, and the light from the light emitting element 8 is reflected by the object to be detected 3.
This is to focus the reflected light onto the light receiving surface of the light receiving element pair 1.2.

FIG. 2 shows an example of the configuration of a representative signal processing circuit connected to the light-receiving element pair 1 shown in FIG.

In the figure, reference numeral 10.11 denotes an amplifier circuit that amplifies the outputs of the light receiving elements 4 and 5 of the light receiving element pair 1, respectively. A differential amplifier circuit 12 differentially amplifies the outputs of the comparison circuits 10 and 11. Note that this differential amplifier circuit 12 has a function as a low-pass filter.

Reference numeral 13 denotes a comparison circuit that compares the voltage with a reference voltage provided by a reference voltage source 14. 15 is a retriggerable monostable circuit that operates in response to the output of the comparator circuit 13 and generates an output.

FIG. 3 is a diagram showing signal waveforms of each part of the apparatus having the above configuration. 1. When the moving object 3 is moving in the direction indicated by the arrow in FIG. 1, the light receiving elements 4 and 5 of the light receiving element pair 1 generate an output. This is amplifier circuit 10.11 and differential amplifier circuit 1, respectively.
2, resulting in an output as shown in FIG. 3(A). This is further applied to a comparison circuit 13, and when it exceeds a certain level, this comparison circuit 13 generates an output as shown in FIG. 3(C). The monostable circuit 15 is triggered by the output of the comparator circuit 13 and generates an output for a certain period of time.

Since a circuit with the same configuration is also connected to the other light receiving element pair 2, the output shown in FIG. 3(B) is generated from the light receiving elements 6 and 7 after a certain time delay from the generation of the output shown in FIG. 3(A). is obtained, and the comparator circuit outputs the waveform shown in FIG. 3(D), and by triggering the monostable circuit with this, the waveform output shown in FIG. 1(F) is obtained.

Here, the time interval between generation and extinction of the output of the monostable circuit by the photodetector pair 1 and 2 is respectively T I e T 3, and the time between generation and spread of both signals is T2. And time T
When I # T 3 has the above relationship, that is, when the output generation of light receiving element pair 1 precedes that of light receiving element pair 2, it is considered to be a positive state, and conversely, when the output generation of light receiving element pair 2 precedes that of light receiving element pair 1 It is considered a negative state when it precedes that of .

The direction of movement of the moving object 3 can be detected based on the polarity of this time T I r 73, and by comparing the times T1 and T2, it is possible to detect whether it is in an acceleration state or a deceleration state.

FIG. 4 is a flowchart for explaining the processing flow when this embodiment is applied to a sensor that detects, for example, the arrival, departure, and passing of two trains.

First, the time T1 is compared with a certain value, and if it is equal to or greater than the certain value, it is determined to be a signal, and if it does not reach that value, it is determined to be noise. Next, regarding the polarity of T+, when it is positive, it is determined that the process is progressing in a certain specific direction, and when it is negative, it is determined that the process is progressing in the opposite direction.

Then, T1. Regarding the magnitude relationship of the absolute value of T2, T,
When the absolute value of T2 is smaller than that of T2, acceleration is determined.

If the absolute value of T1 is not smaller than that of T2, then T! When the absolute value of T2 is larger than that of T2, it is determined that the vehicle is decelerating; otherwise, it is determined that the vehicle is traveling at a constant speed or passing.

Effects of the Invention According to the moving state detection method of the present invention, detection can be performed from a direction perpendicular to the traveling path of a moving object.
Its implementation becomes extremely easy.

The moving state of the object, that is, forward movement, backward movement, acceleration, and deceleration, or both, can be detected as necessary using the two light-receiving element pairs.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the implementation state of the detection method of the present invention, FIG. 2 is a diagram showing an example of the configuration of the signal processing circuit, and FIG. 3 is a diagram showing the signals of each part of the circuit shown in FIG. 2. Diagram showing waveforms,
FIG. 4 is a flow diagram when implementing the method of the present invention. 1.2... Light receiving element pair, 3... Moving object, 4-7... Light receiving element, 8... Light emitting element, 9... ...Lens, 12...Differential amplifier circuit, 13...Comparison circuit, 14...
Reference voltage source, 15...monostable circuit.

Claims (1)

[Claims] First and second light-receiving element pairs, each of which has a pair of light-receiving elements juxtaposed parallel to the movement path of the moving object to be detected, are arranged at a constant interval in the direction of juxtaposition, and the movement of the object to be detected is An optical device for forming an image of the moving object to be detected on the light receiving surface of the first and second light receiving element pair is disposed between the moving path of the object and the first and second light receiving element pair. , the first and second monostable circuits are triggered by the difference signal between the outputs of the first and second light-receiving element pairs, and the output signals of the first and second monostable circuits match or do not match; Alternatively, the moving direction, increase/deceleration, or speed of the detected moving object is detected based on the polarity of the matching or mismatching portion, or the spacing between the matching or mismatching portion and the first and second light-receiving element pairs. A method for detecting a moving state of a moving object, characterized in that: