JP2002098512A - Displacement measuring device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the displacement of an object with low costs and high accuracy. SOLUTION: A direct-acting displacement measuring device 4 projects lights onto the mirror surface 2a of a mirror surface body 2, and measures the detecting point of a reflected light. The direct-acting displacement measuring device 4 calculates the displacement of the object 1 on the basis of the measured displacement of the reflected light. The direct-acting displacement measuring device 4 transmits the calculated displacement to a personal computer 7 through an antenna 5 using radio communications.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for measuring a displacement of an object to be measured, and more particularly, to a method for easily managing the object by measuring the amount of expansion or contraction of the object to be measured. The present invention relates to an apparatus and a method for measuring a displacement amount.

[0002]

2. Description of the Related Art Conventionally, iron and steel structures such as long rails of railway bridges and railway tracks are long structures and the like, so that expansion and contraction accompanying a linear expansion coefficient occurs due to a temperature change of iron and steel itself.

[0003] The amount of displacement due to expansion and contraction of these steel structures is
Above a predetermined threshold, in the worst case, a very dangerous condition such as a crack may occur.

[0004] Therefore, it is necessary to measure the amount of displacement of the target object of these steel structures and to grasp the amount of displacement.

[0005]

However, in the case of the conventional displacement measuring method, a plurality of workers are required for one measurement, and the number of measurement points is enormous.
The measurement per day has a problem requiring a great deal of labor, time and cost.

In addition, when the displacement of the target object is very small, there is a problem that the measurement is difficult.

The present invention has been made in view of such circumstances, and is intended to measure the displacement of a target object at low cost and with high accuracy.

[0008]

According to the present invention, there is provided a displacement measuring device which is disposed on a side surface of a target object and has a reflecting surface for reflecting light in different directions depending on the incident position. Light-emitting means for emitting light to be irradiated, light-receiving means for receiving reflected light reflected by the reflecting means, and calculating means for calculating the amount of displacement of the rail based on the light-receiving position of the reflected light received by the light-receiving means And characterized in that:

The reflecting means is constituted by, for example, the mirror body 2 shown in FIG. 1, and a mirror surface 2a having a mirror reflection characteristic on a side surface thereof.
Are formed.

The light emitting means is constituted by, for example, the light emitting unit 21 shown in FIG. 3, and irradiates the mirror surface 2a of the mirror body 2 with light.

The light receiving means comprises, for example, a plurality of light receiving sections 22-1 to 22-9 shown in FIG. 3 and receives light reflected by the mirror surface 2a of the mirror body 2 by any one of them, and outputs a detection signal (position signal). ) Is output to the calculating means.

The calculating means is, for example, the arithmetic processing unit 4 shown in FIG.
2, and calculates the displacement of the target object based on the light receiving position of the reflected light received by any of the light receiving units 22-1 to 22-9.

In the displacement measuring apparatus according to the present invention, the displacement of the target object is calculated based on the light receiving position of the light reflected by the reflecting surface.

According to the displacement measuring device of the present invention, the displacement of the target object is calculated based on the light receiving position of the reflected light reflected by the reflecting surface.
The displacement of the target object can be measured with high accuracy.

The displacement measuring apparatus according to the present invention is provided with a time management means for recording or storing the measuring time of the displacement in advance, or for notifying that the predetermined time has arrived at predetermined time intervals. be able to.

The time management means includes, for example, the timer 4 shown in FIG.
4 for managing the measurement time of the displacement of the target object 1.

When the time management means is provided, it is possible to manage the measurement time of the displacement amount of the target object.

Thus, when the measurement time managed by the time management means has arrived, the light emitting means can emit light toward the reflection means arranged on the target object.

The displacement measuring device of the present invention may further include a storage unit for storing the displacement calculated by the calculating unit.

The storage means is, for example, a memory 45 shown in FIG.
And stores the displacement amount of the target object 1 calculated by the arithmetic processing unit 42.

When the storage means is provided, the displacement calculated by the calculation means can be stored until it is transmitted to the personal computer.

The displacement measuring device according to the present invention may further include a transmitting means for transmitting the displacement calculated by the calculating means to another device.

The transmitting means is, for example, the modulation circuit 46 shown in FIG.
And the amount of displacement of the target object calculated by the calculating means 42 is wirelessly transmitted to the antenna 6 of the personal computer 7 as a radio wave.

When the transmission means is provided, the displacement of the target object 1 stored in the storage means can be transmitted to another device.

The calculating means in the displacement measuring device of the present invention calculates an average value from the light receiving positions of the plurality of reflected lights received by the light receiving means, and calculates the displacement amount of the target object based on the average value. You can make it.

Thus, the calculating means can calculate the displacement of the target object from the more reliable measurement data.

The reflecting surface in the displacement measuring device according to the present invention can be substantially arc-shaped.

This makes it relatively easy to form the reflecting surface.

According to the displacement measuring method of the present invention, an arranging step of arranging, on the side surface of a target object, a reflecting surface that reflects light in different directions according to the incident position, and emits light to be irradiated toward the reflecting surface. A light emitting step, a light receiving step of receiving the reflected light reflected by the reflecting surface, a measuring step of measuring a light receiving position of the reflected light received by the processing of the light receiving step, and a measuring step of the reflected light measured by the processing of the measuring step. Calculating a displacement amount of the target object based on the light receiving position.

The light emission step is constituted by, for example, step S3 of FIG. 7, the light receiving step is constituted by, for example, step S4 of FIG. 7, and the measurement step is constituted by, for example, step S5 of FIG. Is configured by, for example, step S9 in FIG.

In the displacement measuring method according to the present invention, the displacement of the target object is calculated based on the light receiving position of the light reflected by the reflecting surface.

According to the displacement measuring method of the present invention, the displacement of the target object is calculated based on the light receiving position of the reflected light reflected by the reflecting surface.
The displacement of the target object can be measured with high accuracy.

[0033]

FIG. 1 is a diagram showing a configuration example of a displacement measuring device to which the present invention is applied.

A mirror 2 is attached to the side of the target object 1. A linear displacement measuring device 4 is fixed to the base 3 after its position has been adjusted in the longitudinal direction of the target object 1. That is, the linear motion displacement measuring device 4 irradiates light to the vertex 2at of the mirror surface 2a from the light emitting unit 21 (FIG. 3) so that the principle of mirror reflection can be used, and furthermore, the extension of the light is applied to the center C ( In order to pass through FIG. 2), the irradiation position and the direction are accurately matched.

The linear displacement measuring device 4 measures the amount of displacement of the target object 1 by irradiating light to the mirror 2 attached to the side surface of the target object 1 and measuring the light receiving point of the reflected light. . The linear motion measuring device 4 is provided with an antenna 5, and measurement data is wirelessly transmitted to the personal computer 7 via the antenna 5. Of course, it may be transmitted to the personal computer 7 by wire.

FIG. 2 is a view showing the shape of the mirror 2.
As can be seen from the figure, the mirror body 2 has a shape obtained by cutting a part of a cylinder having a radius r, and a mirror surface 2a is formed on a side surface thereof. Therefore, the mirror surface 2a having the specular reflection characteristic
Is located on an arc having a radius r when viewed from above.

FIG. 3 is a diagram showing an example of the configuration of the linear displacement measuring device 4. Before the adjustment, the linear motion displacement measuring device 4 is slidably attached to the base 3 by the bolts 23 inserted through the elongated holes 4a, and the light emitted and emitted by the light emitting unit 21 is emitted. Is adjusted to a position corresponding to the vertex 2at of the arc-shaped mirror surface 2a of the mirror body 2, and then fixed to the base 3 with the bolts 23.

The light emitting section 21 emits light and emits the light toward the mirror 2. The light reflected by the mirror surface 2a of the mirror body 2 is
The light emitted from the light emitting unit 21 is received by any of the light receiving units 22-1 to 22-9 (the light emitted from the light emitting unit 21 has a sufficiently long cross section in FIG. 3), and the detection signal is It is output to the arithmetic processing unit 42 (FIG. 4). The light receiving units 22-1 to 22-9 are arranged at predetermined intervals, and the distance (displacement amount) from the light emitting unit 21 (center) can be determined by the light receiving position.

In the example shown in FIG. 3, the number of the light receiving sections 22 is nine. However, as the number of the light receiving sections 22 is increased and the interval is reduced, the detection can be made wider and with higher resolution. Less than,
When it is not necessary to individually distinguish the light receiving units 22-1 to 22-9, they are simply referred to as light receiving units 22. The same applies to other devices.

FIG. 4 is a block diagram showing a detailed configuration example of the linear motion displacement measuring device 4. As shown in FIG.

The control unit 43 monitors the timer 44, and when a preset measurement time (date and time) comes, the light emitting unit 21
Is controlled to emit light, and the light is emitted toward the mirror 2. When receiving a command from the personal computer 7, the control unit 43 controls the arithmetic processing unit 42 and
The measurement data stored in 5 is supplied to the modulation circuit 46 and modulated, and then transmitted via the antenna 5.

The light receiving section 22 receives the light reflected by the mirror surface 2 a under the control of the control section 43 and outputs a detection signal to the arithmetic processing section 42. The temperature sensor 41 is a target object 1
Is measured and output to the arithmetic processing unit 42.

The arithmetic processing unit 42 calculates the amount of displacement of the target object 1 based on the position signal input from the light receiving unit 22 under the control of the control unit 43, and stores the amount of displacement in the memory 45 and the temperature sensor. The temperature measurement (measurement) data at that time inputted from 41 is also stored in the memory 45.

The modulation circuit 46 FM-modulates the measurement data supplied from the arithmetic processing section 42 based on the control of the control section 43, and transmits the modulated data to the personal computer 7 via the antenna 5.
Is transmitted as a radio wave to the antenna 6 provided in the. Here, the transmitted radio wave includes, for example, 92 MHz to 98 M
A band of Hz is used, and measurement data such as the temperature and displacement of the target object 1 is transmitted at, for example, 2400 bps.

FIG. 5 is a block diagram showing a detailed configuration example of the personal computer 7.

The CPU (Central Processing Unit) 51
Various processes are executed according to programs stored in a ROM (Read Only Memory) 52 or a hard disk drive 59. A RAM (Random Access Memory) 53 appropriately stores programs and data necessary for the CPU 51 to execute various processes. CPU51, ROM5
2, and the RAM 53 are connected to each other via a bus 54, and are also connected to an input / output interface 55.

The input / output interface 55 includes an input unit 56 composed of a keyboard and a mouse, and an LCD (Liquid Crysta).
l), an output unit 57 composed of a CRT (Cathode Ray Tube), a speaker, etc., a demodulation circuit 58 for demodulating radio waves received by the antenna 6, and a hard disk drive (HDD) 59. A drive 60 for installing a program is connected to the input / output interface 55 as necessary, and a magnetic disk 71, an optical disk 72, a magneto-optical disk 73, a semiconductor memory 74, or the like is mounted.

Next, before describing the operation of the embodiment of the present invention, the principle of specular reflection used in measuring the displacement of the target object 1 will be described with reference to FIG. In addition,
For convenience of description, the mirror 2 is formed in a semicircular shape.

The origin O (0, Y) is at the vertex 2a of the mirror surface 2a.
t represents the position of the light emitting unit 21 when light is irradiated, and the light emitting point A (x ₁ , Y) indicates that the light emitting unit 21 has the origin O
Represents a position moved by a distance x _{1 in the} x-axis direction (longitudinal direction of the target object 1) from the reflection point, and a reflection point (incident point) P (x, y)
Represents the position of the mirror surface 2a where the light emitted from the light emitting unit 21 located at the light emitting point A is incident, and the displacement point Q (x ₁ ,
0) represents the position of the target object 1 after the displacement, and the light receiving point B
(X (x ₁ ), Y) represents a position at which the light reflected at the reflection point P is received by the light receiving unit 22. The center C represents the center of a semicircle of radius r formed by the mirror surface 2a, and xy
It is set as the origin (0,0) of the coordinate system. A straight line connecting the center C and the displacement point Q (hereinafter, such a straight line between the two points is a straight line CQ
) Perpendicularly intersects an extension of the straight line AP.

The distance from the light-emitting point A to the reflection point P is D, and the incident angle of the light from the light-emitting point A at the reflection point P is ω (the tangent at the reflection point P on the mirror surface 2a forming the arc). relative to T _1, the light is assumed to be incident at an angle omega). Therefore, the light emitted from the light emitting point A is reflected at the reflecting point P
Is reflected in a direction equiangular with the incident angle ω with respect to the straight line T ₂ extending the straight line CP (reflected at an angle 2ω with respect to the straight line AP).

Here, the segment AB = X (x
₁ ) is represented by the following equation (1). Line segment AB = X (x ₁ ) = Line segment AP · tan (2ω) (1)

A triangle CP consisting of the center C (0, 0) of the mirror surface 2a, the incident point P (x, y), and the displacement point Q
The angle θ between the line segment CP and the line segment CQ in Q, and the line segment C
A relationship expressed by the following equation (2) is established between P and the angle ω formed by the line segment PQ. ω = (π / 2) −θ (2)

Based on the above equation (2), tan (2ω)
Is represented by the following equation (3) by the addition theorem of trigonometric functions. tan (2ω) = tan2 ((π / 2) −θ) = tan (π−2θ) = (tanπ−tan2θ) / (1 + tanπ · tan2θ) where tanπ = 0, Here, (the closer [pi / 2) is greater enough value of θ is, so _{tanθ ≒ r / x 1, tan} (2ω) = - (2r / x 1) / ((1- (r / x 1 _{^{) 2) = -2rx 1 / (}} x 1 2 -r 2) = 2rx 1 / (r 2 -x 1 2) here, since ^{_{r 2 »x 1 2, tan (}} 2ω) ≒ 2rx 1 / r 2 = (2 / r) · x ₁ (3)

From the above equation (3), the above equation (1) is represented by the following equation (4). Line segment AB = X (x ₁ ) = line segment AP · (2 / r) · x ₁ = D · (2 / r) · x ₁ (4)

From the above equation (4), the displacement x ₁ is expressed by the following equation (5). x ₁ = X (x ₁ ) / (D · (2 / r)) = (X (x ₁ ) · r) / 2D (5)

That is, since the radius r and the distance D are known, the displacement x ₁ can be calculated by measuring the reflected light displacement X (x ₁ ).

Next, referring to the flowchart of FIG.
The displacement amount measurement processing of the target object 1 executed by the linear displacement measurement device 4 will be described.

In step S1, the control unit 43 monitors the timer 44 to determine whether or not the measurement time has arrived. If it is determined that the measurement time has not yet arrived, the control unit 43 determines in step S1 that the measurement time has not elapsed. Wait until it is determined that it has arrived. When the measurement time has arrived, the process proceeds to step S2, where the control unit 43 initializes the value N of the counter to zero.

In step S3, the light emitting section 21 irradiates the mirror surface 2a with light under the control of the control section 43. In step S4, the light receiving units 22-1 to 22-2
-9 receives the light reflected by the mirror surface 2a,
The detection signal is output to the arithmetic processing unit 42. Step S
In 5, the arithmetic processing unit 42 calculates the reflected light displacement X (x ₁ ) from the signal obtained in the process of step S4.

That is, when the target object 1 is not expanded or contracted, it is adjusted in advance, and the reflected light is transmitted to the light receiving section 22-5.
Is received by the The target object 1 expands, for example, as shown in FIG.
As shown, when a vertex 2at a mirror 2a of the mirror body 2 is displaced only left a distance x ₁ from the light emitting point A of the linear displacement measuring device 4, as the displacement amount is large, the light receiving section 2
Of the 2-6 to 22-9, the light is received by the outer light receiving unit (right side in FIG. 3). The distance between the light receiving portion 22-5 of the light receiving portion and the center which receives the reflected light is obtained as the reflected light displacement X (x _1).

Conversely, if the object 1 is reduced and the vertex 2at is displaced rightward in FIG. 6, the reflected light is received by the light receiving units 22-4 to 22-1 on the left side of the light receiving unit 22-5. Then, the reflected light displacement X (x ₁ ) is obtained in the same manner as described above.

In step S6, the control section 43 increments the value N of the counter by one, and in step S7
Then, it is determined whether or not the value N of the counter has become larger than a predetermined number of measurements (reference number) set in advance. If it is determined in step S7 that the value N of the counter is not greater than the predetermined number of measurements, the process returns to step S3 and repeats the above-described processing.

In step S7, if it is determined that the value N of the counter has become greater than a predetermined number of measurements (for example, a predetermined number of times from 10 to 100),
Proceeding to step S8, the arithmetic processing unit 42 reads a plurality of reflected light displacement amounts X (x ₁ ) stored in the memory 45 and calculates an average value thereof. Thereby, more reliable measurement data can be obtained.

In step S9, the arithmetic processing unit 42
Is the reflected light displacement X calculated in step S8.
The (x ₁₎ is substituted in equation (5), calculates the amount of displacement x _1. The arithmetic processing unit 42 stores the calculated displacement amount x ₁ in the memory 45 together with the temperature measurement data measured by the temperature sensor 41.
And the process is terminated.

As described above, by using the principle of specular reflection, the displacement amount of the target object 1 can be measured easily and with high accuracy.

Next, referring to the flowchart of FIG.
The measurement data reception processing executed by the personal computer 7 will be described.

In step S21, the CPU 51 of the personal computer 7 requests the linear motion displacement measuring device 4 to transmit measurement data via the antenna 6. Upon receiving the request, the linear motion displacement measuring device 4 reads the measurement data stored in the memory 45 in response to the request, modulates the measurement data with the modulation circuit 46, and transmits the modulated data to the personal computer 7 via the antenna 5.

In step S22, the demodulation circuit 58 of the personal computer 7 demodulates the radio wave received via the antenna 6. The CPU 51 stores the demodulated measurement data in the RAM 53 and, if necessary, in the hard disk drive 59, and the process ends.

Next, referring to the flowchart of FIG.
The displacement determination processing executed by the personal computer 7 will be described.

In step S31, the CPU 51
The measurement data (displacement amount) stored in 53 or the hard disk drive 59 is read. In step S32, the CPU 51 determines whether the measurement data read in the process of step S31 is a value larger than a predetermined threshold, and determines that the measurement data is larger than the predetermined threshold. If so, the process proceeds to step S33, where CP
The U51 causes the output unit 57 to output a warning by voice or message via the bus 54 and the input / output interface 55. As a result, for example, a message “The displacement of the target object is large, so please repair it” is output.

If it is determined in step S32 that the measured data is not greater than the predetermined threshold value, the target object 1 has not yet been displaced enough to be repaired. Will be terminated.

If the real-time processing is not required, in step S32, a measurement result showing a displacement larger than the threshold value is printed on paper or the like, and is handed over to a maintenance worker to perform maintenance work.

In the above description, a plurality of reflected light displacements X (x ₁ ) are measured by the linear motion displacement measuring device 4 and the average value and the displacement are calculated. The calculation of the average value of the reflected light displacement and the displacement of the target object 1 may be performed by the personal computer 7.

Next, the method of measuring the amount of displacement using the principle of specular reflection will be described in more detail with reference to specific numerical examples.

Radius r of mirror surface 2a = 200 mm, light emitting point A
When the distance D from the reflection point P to the reflection point P is 1000 mm,
The reflected light displacement X (x ₁ ) is represented by the following equation.

That is, the displacement x ₁ of the target object ₁ is 1 m
m, the displacement X (x ₁ ) of the reflected light at the light receiving point B = 1.
It can be measured as 0 mm.

Therefore, for example, the displacement amount x _{1 of the} target object ₁
Is ± 20 mm, the reflected light displacement X of ± 200 mm
It can be measured as (x ₁ ).

Further, for example, the radius r of the mirror surface 2a is 200
0 mm, distance D from light emitting point A to reflection point P = 1000
mm, the reflected light displacement X (x ₁ ) is represented by the following equation.

Therefore, for example, the displacement amount x _{1 of the} target object ₁
Is ± 200 mm, the reflected light displacement X of ± 200 mm
It can be measured as (x ₁ ).

As described above, the target object having a large displacement is
When measuring a target object having a small displacement amount, it is possible to perform measurement by the same principle regardless of the magnitude of the displacement amount only by changing the value of the radius r of the mirror surface 2a.

Next, with reference to FIG. 10, a configuration example in which the present invention is applied to a rail displacement amount measuring system will be described. In this system, an amount of displacement, which is an amount of expansion and contraction in the longitudinal direction of a long rail for a railway track, is measured.

A personal computer 7 is detachably provided inside the measuring vehicle 93. When the measurement vehicle 93 travels on the long rail 91, the left and right antennas 6-L (not shown) and the right antenna 6-R attached to the left and right of the lower surface of the measurement vehicle 93,
The measurement data received from the linear displacement measuring device 4-L and the linear displacement measuring device 4-R are stored in the hard disk drive 59 of the personal computer 7.

The base 3 is placed on the reference piles 92-L and 92-R.
-L, 3-R are provided, respectively, and the bases 3-L, 3 are provided.
With respect to -R, the linear motion displacement measuring devices 4-L and 4-R are respectively fixed after their positions are adjusted in the longitudinal direction of the long rail 91.

The linear displacement measuring devices 4-L and 4-R are mirror bodies 2-L attached to the outer side surface of the long rail 91.
(Not shown), the displacement of the long rail 91 is measured by irradiating light to 2-R and measuring the light receiving point of the reflected light. The linear displacement measuring devices 4-L and 4-R are provided with antennas 5-L and 5-R, respectively, and measurement data is transmitted to the personal computer 7 by radio. Of course,
The measurement data may be transmitted to a predetermined center by a wire arranged along the long rail 91. In addition, the power supply of the linear motion displacement measuring device 4 can use a solar cell, for example, and can eliminate the need for power supply work.

As shown in FIG. 11, the mirror body 2 is previously fixed integrally to a mounting bracket 101, and the mounting bracket 101 is fixed to a long rail 91 with a bolt 102 for tightening. It is attached.

Next, the operation of the embodiment of the rail displacement measuring system will be described. The displacement measuring process of the long rail 91 executed by the linear displacement measuring device 4 is the same as the process described with reference to FIG. The description is omitted because it is the same.

Next, the measurement data collection processing executed by the personal computer 7 will be described with reference to the flowchart of FIG.

In step S41, the measurement vehicle 93
Starts traveling in the line section where the displacement is measured. In step S42, the personal computer 7 determines whether or not all the measurement data has been received from the linear motion displacement measuring device 4 in the line section where the displacement amount is measured, and has yet received all the measurement data. If it is determined that there is not, the process proceeds to step S43. Since the measurement data includes the management number of the linear motion displacement measuring device 4, it is determined whether or not all the measurement data has been received from the management number.

In step S43, the personal computer 7 requests transmission of the measurement data to the linear motion displacement measuring device 4 of the next management number via the antenna 6.
Upon receiving this request, the linear motion displacement measuring device 4 reads out the measurement data stored in the memory 45 in response to this request, modulates it with the modulation circuit 46, and transmits it to the personal computer 7 via the antenna 5. The measurement vehicle 93 executes this processing while continuing to travel.

Then, in step S44, the demodulation circuit 58 of the personal computer 7 demodulates the radio wave received via the antenna 6. The CPU 51 stores the demodulated measurement data in the RAM 53 and, if necessary, in the hard disk drive 59, and returns to step S42.

If it is determined in step S42 that all the measurement data has been received in the line section where the displacement amount is measured, the process proceeds to step S45, and the measurement vehicle 93
Ends the running, and the process ends.

The displacement determination processing is the same as the processing described above with reference to FIG. 9, and a description thereof will be omitted.

In the above description, the linear motion displacement measuring devices 4-L and 4-R are provided on the left and right with respect to the long rail 91. For example, as shown in FIG. And one side (in the case of FIG. 13, the left side)
Alternatively, the base 3 may be provided perpendicular to the ground, and the linear motion displacement measuring devices 4-L and 4-R may be fixed to the base 3.

Further, if necessary, a simple movable cover made of synthetic resin may be provided between the linear motion displacement measuring device 4 and the mirror body 2 in order to avoid dust, rain or snow. Good.

Furthermore, the mirror surface 2a may be formed along an elliptical or polygonal line, or along two sides of a triangle. In short, when the incident position moves in parallel, It is only necessary to reflect the light in different directions according to it.

[0096]

According to the displacement amount measuring apparatus and method of the present invention, the displacement amount of the reflected light reflected by the reflecting surface is determined based on the displacement amount.
Since the displacement of the target object is calculated, the displacement of the rail can be measured at low cost and with high accuracy.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration example of a displacement measuring device to which the present invention is applied.

FIG. 2 is a view showing a shape of a mirror body of FIG. 1;

FIG. 3 is a diagram showing a configuration example of the linear motion displacement measuring device of FIG. 1;

FIG. 4 is a block diagram showing a configuration example of the linear displacement measuring device of FIG. 1;

FIG. 5 is a block diagram illustrating a configuration example of the personal computer of FIG. 1;

FIG. 6 is a diagram illustrating the principle of specular reflection.

FIG. 7 is a flowchart illustrating a displacement measurement process.

FIG. 8 is a flowchart illustrating a measurement data receiving process.

FIG. 9 is a flowchart illustrating a displacement amount determination process.

FIG. 10 is a diagram showing a configuration example of a rail displacement amount measurement system to which the present invention is applied.

FIG. 11 is a diagram illustrating attachment of a mirror body to a long rail.

FIG. 12 is a flowchart illustrating a measurement data collection process.

13 is a diagram showing another example of installation of the linear motion displacement measuring device of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Target object 2 Mirror body 2a Mirror surface 3 Base 4 Linear displacement measuring device 5 Antenna 6 Antenna 7 Personal computer 21 Light emitting unit 22-1 to 22-9 Light receiving unit 41 Temperature sensor 42 Operation processing unit 43 Control unit 44 Timer 45 Memory 46 Modulation circuit 51 CPU 58 Demodulation circuit

Claims (7)

[Claims] 1. A reflecting means disposed on a side surface of a target object and having a reflecting surface for reflecting light in different directions according to an incident position; a light emitting means for emitting light for irradiating the reflecting means; A light receiving unit that receives the reflected light reflected by the reflecting unit; and a calculating unit that calculates a displacement amount of the target object based on a light receiving position of the reflected light received by the light receiving unit. Displacement measuring device. 2. The apparatus according to claim 1, further comprising a time management unit configured to manage a measurement time of the displacement amount, wherein the light emitting unit emits light toward the reflection unit when the measurement time managed by the time management unit has arrived. The displacement measuring device according to claim 1, wherein the displacement is measured. 3. The displacement amount measuring apparatus according to claim 1, further comprising a storage unit that stores the displacement amount calculated by the calculation unit. 4. The displacement measuring device according to claim 1, further comprising a transmitting unit that transmits the displacement calculated by the calculating unit to another device. 5. The calculating means calculates an average value from a plurality of light receiving positions of the reflected light received by the light receiving means, and calculates a displacement amount of the target object based on the average value. The displacement measuring device according to claim 1, wherein: 6. The displacement measuring device according to claim 1, wherein the reflection surface is substantially arc-shaped. 7. An arranging step of arranging, on a side surface of the target object, a reflecting surface that reflects light in different directions according to an incident position; an illuminating step of emitting light for irradiating the reflecting surface; A light receiving step of receiving reflected light reflected by a surface; a measuring step of measuring a light receiving position of the reflected light received by the processing of the light receiving step; and a light receiving of the reflected light measured by the processing of the measuring step Calculating a displacement amount of the target object based on the position.