JPS6118809A - Non-contacting multi-point displacement measurement - Google Patents

Abstract

PURPOSE:To effect measurements of the amounts of displacement, such as displacement of a structure and land subsidence, by reflecting by an incident ray reflector of a detecting rod existence of fine fluxes of laser beams and detecting with a light-receiving sensor. CONSTITUTION:A laser irradiating apparatus 1 is shifted by the constant distance by a displacing means and, using an automatic swivelling mechanism 2, a laser beam speed L from the apparatus 1 is scanned at each time within the specified angle or along the entire periphery. During these operations, at the moment when a reflected beam L from the detecting rod 10 is detected by a light-receiving sensor 8, displacement and distance data obtained by a displacement distance detecting mechanism 5 are introduced into a central processing mechanism 9 and stored. Later, the newly introduced displacement distance is compared with a value stored with the swivelling angle stored top most and a difference is obtained as the displacement distance.

Description

[Detailed description of the invention] The present invention relates to a non-contact multi-point displacement measurement method in the displacement measurement direction, and its purpose is to propose a new displacement measurement method for use in measuring the displacement of structures, ground subsidence, etc. do.

Conventionally, measuring instruments such as transits or communication pipes have been used to measure the amount of displacement such as the displacement of structures or ground subsidence, but this type of measurement generally requires measurements at multiple points over time. However, the measurement work was extremely troublesome.

The present invention has been made in view of the above problems, and aims to propose a method for relatively easily and accurately measuring the amount of displacement at multiple points. In other words, the non-contact multi-point displacement measurement method of the present invention uses an incident light reflector or a light-receiving object at a plurality of desired positions on a straight line from a point outside the object to be measured that have no obstructions. A detection rod provided with a sensor is attached via a posture stabilizing mechanism, and a movement amount detection mechanism is provided at a point outside the object to be measured to move parallel to the displacement measuring direction of the object to be measured, and the rod is perpendicular to the movement axis. A laser emitting device that automatically rotates within a plane and is equipped with an angle detection mechanism is installed, and the presence or absence of a narrow beam of laser light projected from the laser emitting device is reflected by the incident light reflector of the detection rod. and detect it with a light receiving sensor attached to a part of the laser emitting device or with a light receiving sensor attached to a detection rod,
This method is characterized in that the amount of displacement of the object to be measured is measured by a movement amount detection mechanism provided on the pivot axis of the laser emitting device.

Embodiments of the present invention will be described below based on the drawings. FIGS. 1 to 3 show the first embodiment. The displacement measurement direction of the object to be measured (11) is the vertical direction (arrow A). (1) is a laser emitting device installed at a point outside the object to be measured (a) so that the axis of rotation (0) is parallel to arrow A, and the plane is perpendicular to the axis of rotation (0) by the automatic rotation mechanism (2). The automatic rotation mechanism (2) detects the rotation angle while emitting a narrow beam of laser light of a certain wavelength in the desired rotation direction. Further, the pivot shaft (0) is provided with a moving means such as a threaded structure between the base (3) and the pivot surface of the laser emitting device (1) to continuously move the pivot surface of the laser emitting device (1) in the direction of the pivot shaft (0). (4) and a movement amount detection mechanism (5) for detecting the amount of movement thereof, and a laser emitting device (1).
A condenser (7) that becomes a parabolic mirror or a telephoto lens as part of the
A light receiving sensor (8) such as a photodiode or a TV camera is installed at the focal position of the condenser (7), and the light receiving sensor (8) is connected to a central processing mechanism (9) which will be described later.
connected to.

(lO) is a detection rod provided on the side of the object to be measured (a), and the lower end of the detection rod (lO) is connected to the pole joint (II).
) is pivotally connected to the end of the bracket (12) for attachment to the object to be measured (a) via a posture stabilizing mechanism such as ( Due to the load of +3), the detection rod (10)
is supported in the vertical direction. Further, (14) is an incident light reflector such as a reflective tape or a mirror-finished plate formed approximately in the center of the detection rod (10), which reflects the laser beam in the projection direction, and reflects the incident light. At the upper and lower positions of the body (14), there is a transparent material that transmits the laser beam or an incident light absorbing structure (such as a prism) that does not reflect the laser beam in the incident direction.
15) (15) is formed.

The central processing mechanism (9) uses the light receiving input signal of the light receiving sensor (8) as a trigger to determine the turning angle of the laser emitting device (1) at that time from the output signal of the automatic turning mechanism (2), and at the same time, the moving means (4). The amount of movement is read from the movement amount detection mechanism (5) and stored, and then the movement and rotation scans are repeated and compared with the stored position.

In the above embodiment, multiple points al, a2 of the object to be measured (a)
．． When measuring the displacement (displacement direction A) of a3, as shown in FIG. 3, the laser emitting device (1) is located at a position al, a2.
Select a3 and install the detection rod (1o).

Thereafter, the moving means (4) sequentially moves the turning plane by a certain amount, for example from bottom to top, and each time the automatic turning mechanism (2) turns the laser beam (L) from the laser emitting device (1). Scan within a certain angle or all around the surface. During this operation, multiple points al, a2.
When the light receiving sensor (8) detects the reflected light (L) from each detection rod (10) of 'a3, the movement amount detection mechanism (
5), the movement and distance from the reference position 1jQ) #Ml
, fL2.13, and al, a2. Angle θ1 from the reference direction (θ0) of a3
．． θ2. θ3 is input to the central processing mechanism (9) 1, and its moving distance and turning angle are stored as initial values.

From this state onwards, the moving means (4) and the automatic turning mechanism (2) are scanned in the same way, and the newly input moving distance and turning angle are compared with the previously stored initial values, and the difference between the readings of the moving distance is determined. can be determined as the amount of displacement of the object to be measured (a).

At this time, the turning angle is determined by the multiple points al, a2. i13
It is used to determine the

In addition to the method of inputting the moving distances of multiple points while substantially continuously scanning the moving means (4) and the automatic turning mechanism (2) in an arbitrary range as described above, the following method may be used. The second method is to prepare the initial value statement 1 for the travel distance and turning angle in advance. first time,! 13 and al, , a2.
a3, the laser beam (
The moving means (4) and the automatic rotation mechanism (
2) is synchronously driven.

When there is no displacement of the object to be measured (a), the laser beam (L)
is reflected by the incident light reflector (14) of the detection rod (10), the light receiving sensor (8) is turned on, and the central processing mechanism (8)
Input that there is no displacement. Further, when the object to be measured (a) is displaced, the laser beam (L) is not reflected and the light receiving sensor (8) remains in the OFF state. In this state, operate the moving means (4) to move the laser emitting device (1) in the vertical direction and search for the position where the reflected light of the laser beam (shi) turns on the light receiving sensor (8). thing(
The amount of displacement in a) can be measured by the difference in the readings of the movement amount detection mechanism (5), and by repeating this,
Higher yield al.

a2. The displacement of a3 over time can be measured.

Next, FIGS. 4 and 5 show another embodiment of the present invention. To explain only the differences from the first embodiment, in this embodiment, a light receiving sensor (8a) is provided on the detection rod (10) side.

At the center of the detection rod (10) is a light receiving element (8a) provided with a laser filter (16) that transmits only the laser beam (L).
) is provided to face the front of the detection rod (10), and an amplifier circuit (17) for amplifying the light reception signal of the light receiving element (8a) is provided.
) via a transmitter (18) and a receiver (1) that manually transmits the signal input to the central processing unit (8) by wireless or wired means.
9) and becomes a structure for transmitting information. In this embodiment, the laser beam (L) emitted from the laser emitting device (1) is directly received by the light receiving sensor (8a) of the detection rod (10), and the measurement operation is the same as in the first embodiment. be.

In the previous embodiments, the displacement direction of the object to be measured was vertical, but as shown in FIG. 6, the displacement direction (A) of the object to be measured was horizontal, and the laser emitting device ( The present invention can also be applied to the case where the rotation axis (0) of 1) and the direction of movement by the moving means (4) are also parallel to the displacement direction (A). In this case, the detection rod (10) is supported by a bracket (12) so as to be held horizontally, and the balance weight (13) shown in FIGS.
) is unnecessary.

As described above, according to the displacement measurement method of the present invention, the measurement position can be fixed at a position away from the object to be measured, so it is useful in measuring displacement over time such as in building destruction experiments. Instead, it has the feature of being able to measure displacement at multiple points at a single measurement position. Further, according to the displacement measuring method of the present invention, an unmanned measuring device can be constructed by automating the turning mechanism and the means for moving the turning axis, and the effects of the present invention are extremely large.

[Brief explanation of the drawing]

The drawings show an embodiment of the non-contact multi-point displacement measurement method of the present invention, in which Fig. 1 is an explanatory diagram showing the first implementation method, Fig. 2 is a front view of the same detection rod, and Fig. 3 (a). ) and (b) are explanatory diagrams showing the turning state of the laser emitting device, FIG. 4 is an explanatory diagram showing the second implementation method, FIG. 5 is a side view of the same detection rod, and FIG.
The figure is an explanatory diagram showing the third implementation method. (1) Laser emitting device (2) Automatic rotation mechanism (4)
Movement means (5) Movement amount detection mechanism (7) Concentrator (8) (8a) Light receiving sensor (8) Central processing mechanism (10) Detection rod (13) Balance weight (14) Incident light reflector (17) Amplification Circuit (1
J) Transmitter (19) Receiver (a) Object to be measured
(L) Laser beam patent applicant Fujita Kogyo Co., Ltd. Figure 1 Figure 2 Figure 5 Figure 3 (a) (b) Figure 4 Figure 6

Claims (1)

[Claims] A detection rod equipped with an incident light reflector or a light-receiving sensor is placed at one or more desired measurement positions on a line segment from a point outside the object to be measured that has no obstructions, and is placed in a stable position. A movement amount detection mechanism is attached via a mechanism and is provided at a point outside the object to be measured to move in parallel in the direction of measuring the displacement of the object to be measured, and the mechanism rotates in a plane perpendicular to the movement axis, and the rotation angle detection mechanism is provided at a point outside the object to be measured. A laser emitting device equipped with the equipment is installed, and the presence or absence of a narrow laser beam irradiated from the laser emitting device is detected by a light receiving sensor provided on the laser emitting device side using the incident light reflector of the detection rod, or A non-contact multi-point displacement measurement method characterized in that the amount of displacement of an object to be measured is detected by a light-receiving sensor provided, and the amount of displacement of an object to be measured is measured by moving a laser emitting device in parallel and using a movement amount detection mechanism provided on its rotation axis.