JPH01136010A - Clinometer - Google Patents

Abstract

PURPOSE:To accurately measure an angle of inclination without affected by vibrations, by measuring the angular velocity accompanied by the change of an angle of inclination using an optical fiber gyroscope to integrate the same. CONSTITUTION:A frame body is constituted of a pedestal having a measuring plane 11a to be brought into contact with a surface to be measured formed thereto and the holding part 3 protruding from the central part of the pedestal 11 in a narrow width in a predetermined direction, and the sensor fiber loop 2 of a fiber gyroscope is wound in both of the pedestal 11 and the support part 3 so as to be present within the plane vertical to the measuring plane 11a. A phase modulation type optical fiber gyroscope 3 is mounted in the frame body. When an object to be measured is inclined, the angular velocity accompanied by rotation is sensed by the phase modulation type fiber gyroscope and integrated to display an angle of inclination on a display device 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an inclined needle using an optical fiber gyro.

[Conventional technology]

Conventional devices for measuring the angle of inclination use a pendulum, and a position detector detects the movement of the pendulum as the angle of inclination changes, while a torquer is used to determine the position of the pendulum. There were so-called servo accelerometer-type devices configured to return the sensor to the angle of inclination, and devices that used liquid and used capacitance to detect the position of the liquid surface that moved as the inclination angle changed.

Furthermore, as another means of measuring the tilt angle, there is also a device that measures the rotation angle of a rotary encoder, for example, by installing a sensor at the center of rotation when the tilt changes, and measuring the change in tilt as the rotation angle. Ta.

[Problem that the invention seeks to solve]

However, a pendulum or a tilting needle that uses the liquid level is inherently sensitive to not only changes in the tilt angle, but also to fluctuations that involve acceleration such as vibration and parallel movement, and these are sensitive to changes in the tilt angle. This limits the measurement conditions and measurement locations, causing errors or making measurements difficult in areas with a lot of vibration.

In addition, in a device that measures the tilt angle by rotating the angle, there is a limitation that the measurement sensor must always be at the center of rotation.1. Eccentricity between the sensor and the center of rotation has been a source of error in accurate measurements.

[Means for solving problems]

In order to solve the above problems, the present invention uses an optical fiber gyro as a sensor, detects the angular velocity accompanying the change in the tilt angle with the optical fiber gyro, and further integrates it to measure the tilt angle. .

[For production]

Therefore, in the present invention, since the inclinometer reacts only to the angular velocity accompanying the rotational movement, only changes in the inclination angle can be accurately measured even when vibration or parallel movement is involved.

Furthermore, the position of the fiber gyro has no relation to the center of rotation, so it can be installed at any position on a tilting object, and there is no need to take eccentricity into account.

〔Example〕

FIG. 1 shows one embodiment of the present invention, in which the frame body includes a pedestal 11 forming a measuring plane 11a for contacting the surface to be measured, and a frame body 11 having a width narrower than that of the central pedestal 11 of the pedestal 11. It consists of a protruding holding part 3 and a pedestal 11.
A fiber loop 2 for the sensor of the fiber gyro is disposed in the supporting part 3 in a plane perpendicular to the measuring plane 11a.
A so-called phase modulation type optical fiber gyro 3 is built into the frame. Also, on the outside of the main body, there is a display 4 for displaying the tilt angle, a reset switch 5 for setting the display to 0, and a switch 5 for turning on the power.
A power switch 6 for FF is installed.

Measurement of the inclination angle using the inclinometer 1 configured as above will be explained.

The surface 11a to be measured of the inclinometer 1 is brought into close contact with the inclined object 7 to be measured as shown in FIG. Now turn the power switch 6 to
When the setting is set to N and the reset switch 5 is pressed, the angle display becomes O.

As shown in Fig. 3, when the object to be measured rotates (tilts), the phase modulating fiber gyro senses the angular velocity accompanying the rotation, and by integrating this angular velocity, the tilt angle is displayed on the display 4. be done.

In this embodiment, only one optical fiber gyro is built in, and only the inclination angle in rotation within the plane of the paper in FIGS. 2 and 3 can be measured. However, two or three optical fiber gyros are installed. Of course, if they are arranged so that they are orthogonal to each other, the inclination angle can be measured two-dimensionally or three-dimensionally. - As an example, a schematic diagram of an inclinometer capable of three-dimensional measurement is shown in FIG. 4. In FIG. 4, the same reference numerals as in FIG. 1 indicate the same functional parts. Since the optical fiber gyro can measure the rotation angle in the plane in which the fiber loop is wound, the fiber loops 12 and 22 are provided wound in the plane perpendicular to the fiber loop 2, and each fiber Indicator 14.24 Reset switch 15.2 for tilt measurement by loop 12.22
5 is provided. The outer frame projecting in a cross shape from the substrate 11 to hold the fiber loop 2.12 also serves as a holding portion.

Further, the fiber gyro is not limited to the phase modulation method, and it goes without saying that any type of fiber gyro can be used.

Also, a so-called laser gyro can be used similarly. That is, it goes without saying that the invention can be applied to all optical gyros based on the principle of the Sunack effect, and FIG. 5 shows an optical fiber gyro electrical processing system, particularly a phase modulation type optical fiber gyro. That is, in FIG. 5, light from a light source 52 such as a superluminescent diode enters a photodetector 54 through an optical fiber loop 2 wound within a predetermined plane. A part of the optical fiber loop 2 is wound around a piezo element 52, and the piezo element 52 is expanded and contracted periodically by a signal from an oscillator 53, and a signal from a photodetector 55 is transmitted with a so-called phase difference. It becomes a modulated signal. The signal from the photodetector 54 is subjected to lock-in detection by the oscillator 53 based on the signal from the oscillator 53, and a signal proportional to the angular velocity to be measured is detected.

A signal proportional to the angular velocity detected by the lock-in amplifier 55 is processed by a computer 56 according to a predetermined program. A particularly important function of the computer 56 is the integral function, which determines the rotation angle from the angular velocity. Note that in the case of two-dimensional or three-dimensional, the configuration can be simplified while improving accuracy by sharing the light source 5, piezo element 52, and oscillator 53.

[Effects of the Invention] As described above, according to the present invention, the angular velocity accompanying a change in the tilt angle is measured using an optical gyro, and the tilt angle is determined by integrating the measured angular velocity, so that vibrations etc. The angle of inclination can be measured without being affected, and the inclinometer can be installed anywhere on a tilting object, regardless of the center of rotation of the tilt (it has the advantage of not being subject to any particular restrictions).

[Brief explanation of the drawing]

FIG. 1 is a perspective view of one embodiment of the inclinometer according to the present invention;
Figures 3 and 3 are diagrams showing operating conditions during tilt angle measurement, Figure 4
The figure is a perspective view of a second embodiment of the present invention, and FIG. 5 is a block diagram of the electrical system of a phase modulation type optical fiber gyro. [Explanation of symbols of main parts] 1... Inclinometer, lla... Measurement plane, 2.1
2.22...Fiber loop. Figure 1 Figure 2 Flute Figure 8

Claims (1)

[Claims] It has a measurement plane for contacting the surface to be measured and also has a built-in optical gyro with a sensor fiber loop wound in a plane perpendicular to the measurement plane, and converts the angular velocity signal from the optical gyro into a tilt angle. An inclinometer that is characterized by converting and displaying information.