JP2634780B2 - Tilt measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inclination measuring apparatus for measuring an inclination angle of an inclined tower structure such as a tower leg member.

[0002]

2. Description of the Related Art In order to easily and accurately assemble a structure above a power transmission tower or a radio tower, legs of a base part are accurately installed in units of mm. FIG. 16 shows an example in which a steel tower structure is installed on an underground foundation leg. As shown in the figure, the leg material is generally buried in a vertical hole excavated in the ground with the outer periphery thereof being surrounded by a reinforcing bar and the outside thereof fixed with cement. When installing such a leg material, the leg material is generally inclined, and it is necessary to easily and quickly measure the inclination of the leg material. FIG. 17 shows a conventional method for measuring the inclination of a leg material. When installing the legs, distances such as diagonal diagonal distance, diagonal diagonal distance, and diagonal dimension, height difference (level) of each leg and inclination (falling), verticality (standing) of each leg, The rotation (my-my) is measured (FIG. 18).

[0003] In these measurements, as a method of measuring falling and standing, a weight is lifted with a water thread from the top of the leg material, and FIG.
As shown in FIG. 7 (a), the horizontal distance between the leg material and the water thread is measured with a scale such as a convex. Also, as shown in FIG. 17 (b), the water thread is collimated from the center of the steel tower and checked against the scribe line marked on the leg material.

As a device for measuring the inclination angle of a structure such as the above-mentioned leg material, there is a method of measuring each angle using a level or an inclination sensor.

[0005]

When the inclination angle of a structure such as the above leg material is measured by an inclination angle sensor, the steel tower leg material to be measured generally has a considerable inclination angle. In addition to simply attaching the steel tower legs, if the steel tower legs are attached at a predetermined angle in anticipation of the average inclination angle, the deflection from the reference angle should be small and the measurement accuracy should be improved.

Therefore, in general, when a general inclination angle is to be measured, the inclination can be measured as described above, and the measurement can be performed with sufficient accuracy by attaching the inclination angle sensor to a predetermined angle in accordance with the larger angle of the falling.

However, even in this case, when installing the tower leg material, it is necessary to install the tower within an installation error in a unit of mm (mm), and an extremely high-precision tilt angle sensor is required. Becomes

Various sensors are known for measuring the angle, such as a differential transformer type, a sensor using a magnetoresistive element, or a sensor incorporating a servo detection mechanism in the differential transformer type. In addition, a device having a high angle measurement accuracy such as the servo type described above is extremely expensive, and the handling is delicate, and the operability is not sufficient for quick angle measurement at a steel tower construction site or the like.

Further, the conventional method for measuring the installation dimensions of the tower leg material, especially the measurement of falling and standing, has the following problems.

[0010] It is difficult to completely stop the water thread at the time of normal measurement, and it is also difficult to hold the scale horizontally, so that the measurement accuracy cannot be guaranteed. As shown in FIG. 19, since the reinforcing bar and the water thread interfere with each other, it is necessary to disassemble the reinforcing bar once and measure it.

Since the measurement is performed between narrow reinforcing bars,
Measurement is difficult and measurement accuracy cannot be guaranteed.

The present invention takes into account the various problems of the above-described conventional tilt measuring method, and increases the tilt angle by simply attaching it to a target object without using a water thread for measuring the falling of the structure. It is an object of the present invention to provide a tilt measuring device capable of accurately measuring the falling and standing with sufficient measurement accuracy.

Another object of the present invention is to be able to cope with a case where extremely high precision measurement is required, such as installation of a steel tower leg, to enable quick measurement at a construction site, and to obtain a low cost. To provide a tilt measuring device.

[0014]

According to the present invention, as a means for solving the above-mentioned problems, two sets of tilt angle sensors for outputting a signal proportional to an angle are provided in a storage case.
Attach to a fixed object with a mounting surface with a preset inclination angle
Only, both sensors the inclination angle measurement surface is perpendicular to one another, including the vertical axis and the vertical axis provided in <br/> so to offset the inclination angle of the mounting surface, the errors of each sensor temperature and linearity Correct
Thus, the inclination measuring device is configured to have an output correction circuit .

In one embodiment of the above-mentioned measuring device, the tilt angle sensor comprises two magneto-resistive elements and a magnet combined therewith, and a magnet movably provided in both forward and reverse directions moves in proportion to the angle. Then, it is preferable to output a signal corresponding to the movement amount.

According to a third aspect of the present invention, there is provided the measuring apparatus according to the second aspect , wherein
Output correction circuit of the angular sensor, the temperature correction unit that corrects the corrected to the value at the measurement temperature a zero at zero inclination angle adjusting from the reference temperature, and was previously measured error by the temperature of the output value at the measured temperature data And a linearity correction unit that corrects a linearity error with data measured in advance.

In the tilt measuring device according to any one of the above aspects, a fixing seat for fixing a case accommodating the two tilt angle sensors so that the tilt angle sensor can be easily and accurately attached; A sensor mount fixed to the fixed seat integrally and having a length substantially covering the maximum diameter of the object to be measured; and an angle formed between an upper surface of the fixed seat and a lower surface of the sensor mount is formed by the rolling. It is preferable to use one having a fixed seat formed so as to have a predetermined inclination angle with respect to the angle.

[0018]

In the tilt measuring apparatus according to the first aspect of the present invention, one of the sensors measures the rolling angle of the leg material and the other measures the standing angle. When making such measurements, the sensor storage case
The mounting surface is an average angle at which the legs are inclined in advance.
Attaches to the object to be measured with a preset tilt angle
In the case, the vertical axis of the sensor is
Is provided so as to be as vertical as possible
It is assumed that Sensor with such an inclination angle
Angle of the actual measurement object even if the object is attached to the measurement object
Degrees in most cases do not correspond to the tilt angles measured above.
The vertical axis of the sensor installed in the case is
The tilt angle of the object to be measured
Measure how much you are leaning.

Generally, the tilt angle of a structure is higher when the roll angle is higher.
There is a variety of angles larger than the angle. Therefore,
The tilt angle measurement surface of one tilt sensor is set to a predetermined tilt angle in advance.
Is measured in the direction of the roll angle.
In this way, the tilt sensor generally increases the measured tilt angle.
Even if the error increases in size,
Given a fixed angle, measuring around that angle
Measurement error within a predetermined range.
Thus, accurate measurement of the inclination angle can be realized.

In order to measure such an accurate tilt angle,
The output correction circuit adds temperature and linearity errors
to correct. It was mounted in the case as described above
When the vertical axis of the sensor is used as a new reference, the zero point is shifted.
Therefore, the linearity is incorrect so that the new reference point is centered.
It is necessary to compensate for the difference, and the temperature
This is because it is necessary to correct for errors in measured values at temperature.
You.

In the second invention, the tilt angle sensor of the first invention is used.
The sensor consists of a combination of a magnetoresistive element and a magnetic material.
Is adopted. This sensor is
When the magnet moves in both directions, the angle shifts from the reference position.
An electric signal is generated in proportion to the momentum. The current or
Is the angle measurement by measuring the voltage change against the angle.
Perform settings.

In the third aspect, the tilt using the magnetoresistive element is used.
Measurement error caused by temperature and angle changes of the angle sensor
A circuit to correct the sensor output signal to minimize it
Provided. Of the structures, the legs for the tower are
On average, the rolling angle is around 9 ° due to the shape characteristics.
Often tilted at a certain angle,
To minimize measurement errors due to angle changes.
The reference angle was set to a preset tilt angle.
You. Even with this setting, measurement errors due to changes in temperature and angle cannot be reduced to zero.Particularly when installing tower legs, the ground-side structure of the tower and the legs embedded in the ground The connection with must be accurate in millimeters.

For this reason, the error of the base point of the sensor due to the change of the angle and the error of the output voltage due to the temperature change caused by the large temperature coefficient of resistance of the magnetoresistive element are reduced to the inherent error of each sensor previously measured as much as possible. A correction circuit is provided so as to reduce the error, and the error is kept within an allowable range.

In the correction circuit, the zero point when the tilt angle is previously adjusted to zero is corrected from the reference temperature to the measured temperature, and the sensor output value at the measured temperature is corrected based on the previously measured data. In addition, the linearity of the base point is also corrected based on data measured in advance, and an accurate measurement signal is obtained by correcting both the angle and the temperature.

According to a fourth aspect of the present invention, there is provided a sensor mounting device which is mounted on the top of the leg flange to measure the inclination angle. When the mounting base of the sensor mounting device is mounted on the top of the leg flange through a simple mounting tool, the tilt angle sensor is set to a predetermined tilt angle in advance.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of the tilt measuring device, and FIG. 2 is a front view. In this measuring device, a case 2 is fixed to a mounting frame 1 for mounting on a steel tower leg material A at an inclination angle of 9 ° with respect to a rolling angle direction, and two inclination angle sensors 3 and 4 are provided in the case 2. It is stored. 5 is case 2
The handle 6 provided outside the magnetic base is a magnetic base. When the knob is rotated, the magnetic base 6 turns on the magnetic attraction force, O
It is flip-flopped, and the measuring device is detachable from the leg material A.

Although the tilt angle sensors 3 and 4 are provided vertically in order to make them compact, they may be provided in parallel at the same level. Further, the inclination angle sensors 3 and 4 are provided so that the inclination angle measurement surfaces including the vertical axes thereof are perpendicular to each other. For example, the sensor 3 is used for measuring the falling angle, and the sensor 4 is used for measuring the standing angle.

FIG. 3 shows a functional diagram of the tilt angle sensors 3 and 4. The sensors 3 and 4 of this embodiment have the same structure, and are composed of a combination of a magnet M and two magnetoresistive elements R ₁ and R ₂ as shown in the figure. V ₁ is input, V ₂
The output voltage (V ₃ is output voltage indicative of the temperature change) is.

When the inclination angle of the magnet M is 0 °, the resistances of the magnetoresistive elements R ₁ and R ₂ are equal, and when the magnet M moves in either the left or right direction with the change of the inclination angle, the inclination angle changes. The resistance values of the magnetoresistive elements R ₁ and R ₂ change in response to
Therefore, the output voltage V ₂ is changed. This output voltage V ₂
By measuring the rate of change of the change in response to the angle change, it is possible to measure the inclination angle at that time by measuring the change in the output voltage.

As described above, the two sensors 3 and 4 for measuring the rolling angle and the standing angle use sensors having the same structure. However, the following is applied to the sensors actually used. It needs to be taken into account.

First, the running angle and the standing angle are different in actual leg materials, and generally, the running angle is greatly different for each leg material, and the change in the standing angle is small. As a result of statistically examining the slip angles of the leg materials of the steel tower structures designed in the past as design data, the slip angles are generally within a range of ± 5 ° around 9 °, while The angle is basically 0 ° (the elevation angle is designed as 0 ° in design). Therefore, the case 2 is attached with the inclination angle of the case 2 inclined by 9 ° in advance with respect to the falling angle.

Second, the cost of the above-mentioned sensors is relatively low, but in practice, errors due to temperature and manufacturing errors due to the temperature of each individual sensor are large. Cannot be used with FIG. 4 shows a representative error bare characteristic curve of the measured sensor. Regardless of which angle is measured, the allowable error within the working range is a maximum of 0.
While accuracy of about 3 mm or less is required, for example, +
At 5 °, it is -1.5 mm.

Therefore, the following processing is actually performed. As shown in FIG. 4, the use range of the roll angle is ± 5.
° and the use range of the elevation angle is ± 2 °. Correction is performed so that the error characteristic curve falls within the allowable error within this use range. When making this correction, consider the following: That is, factors causing the error include a change in temperature, a spring constant,
Changes in the viscosity of the oil sealed inside the sensor, dimensional errors of the sensor itself, and the like are given. Therefore, the naked error of each sensor is measured in advance, and a correction program is prepared in the computer so that the characteristic curve of each sensor falls within the allowable error in consideration of the above error factors.

FIG. 5 is a schematic block diagram of a measuring circuit in the inclination measuring device. A computer 14a is incorporated in the measuring circuit, and the correction program is provided therein.

The tilt angle sensors 3 and 4 for measuring the rolling angle (X-axis center) and the elevation angle (Y-axis center) each comprise two magnetoresistive elements as described above. The coefficient is large. Therefore, in this embodiment, the sensor output is processed so that the temperature characteristic error such as the output characteristic and the output voltage ratio temperature characteristic and the reference linearity error can be corrected using the resistance temperature characteristic.

The output signals of the tilt angle sensors 3 and 4 are amplified by the output amplifiers 3X ₁ and 3Y ₁ , and the temperature signals obtained from the change in the resistance value are amplified by the temperature amplifiers 3X ₂ and 3Y ₂ to select the signals. 11 and the A /
The signal is converted from an analog signal to a digital signal by the D converter 13 and sent to the computer 14.

The measurement data sent to the computer 14 is temporarily stored in an I / O port 14a via a data bus 14b via a temporary storage unit 14d (RAM: random access memory).
To a central processing unit (CPU) 14c via a program in a fixed storage unit 14e (ROM: read-on memory).
Various operations are performed in. The result of the calculation is displayed in the display drive unit 1
4f is displayed on the display unit 15 via the output unit 1f.
4g is output to the outside. The output data is sent to, for example, a personal computer in an application example described later. Reference numeral 16 denotes a power supply.

FIG. 6 shows only a program portion for performing a correction calculation of the temperature data included in the program of the ROM 14e. Of course, not only the program in the ROM 14e but also a program for controlling the microcomputer are built-in, but this is omitted.

As shown in FIG.
A temperature data calculation unit 141, a sensor output correction unit 142, a sensor output calculation unit 143, a straight line correction unit 144, and an inclination angle calculation unit 145 are included.

The sensor output characteristic calculating section 143 has the configuration shown in FIG.
The output characteristic data of FIG. 9, the linear correction data of FIG. 9 is output to the linear correction unit 144, the output temperature characteristic error data of FIG. 10 is output to the sensor output correction unit 142, and the output data of FIG.
Are stored. These characteristic data have a variation including a manufacturing error for each of the inclination angle sensors 3 and 4, and therefore are measured and stored in advance for each individual sensor.

The above measurement data is obtained, for example, in the case of temperature characteristic data by measuring the temperature in the range of -25 ° to +8 in 5 ° C. steps.
5 ° (23 points), sensor output tilt angle -5 °, 0 °, +
3 points at 5 °, sensor resistance is 1 point for each of the above points, total 9
Regarding two points and linearity data, one point of sensor resistance and 13 degrees of sensor output were obtained at an inclination angle of -6 ° to + 6 ° in steps of 1 °.
Points, a total of 14 points.

In the tilt angle sensor having the above-described configuration, the measurement data is corrected as follows, and the tilt angle is measured.

Firstly temperature during measurement in step S ₁ is measured. The temperature measurement measures the resistance value of the inclination angle sensor 3, 4, the temperature amplifying section 3X _2, from the amplified signal in step S ₂ in 3Y ₂ measured against the resistance temperature characteristic data of Figure 11 Temperature TaC ° Is read.

[0044] Then the sensor output in step S ₃ corrector 14
The output value at the time of adjusting the tilt angle to zero is read by ₂ and the sensor output value is converted into the temperature at the time of measurement in step S4. With respect to the sensor output value at zero inclination angle, the temperature when zero adjustment is performed at various temperatures in advance and the output value at that temperature are measured as an error value with respect to the output value at the reference temperature (25 ° C.), and the sensor output correction is performed. The error data as shown in the graph of FIG.

Accordingly, the sensor output value at the time of the zero adjustment at the actual measured temperature Ta ° C. is the measured temperature Ta ° C. in the above graph.
Is read out, and is obtained according to the following equation.

ZLV = ZERO-ADJ Here, ZERO is the sensor output value corresponding to the zero adjustment at the reference temperature, ADJ is the zero adjustment error at the actual measured temperature Ta ° C., and ZLV is the error after the error adjustment at Ta ° C. This is the zero adjustment output value.

Next, the sensor output computing unit 14 from the output characteristic data of the sensor output values at Ta ° C. Figure 8 at step S ₅
3 is read. This sensor output value is referred to as ADV. Additionally, zero-corrected in accordance with the equation of the sensor output value ADV in step S ₆ (ADV-ZLV).

[0048] Then, to calculate the tilt angle according to the following equation using the zero-corrected sensor output values in step S _7.

Θ = ｛(ADV-ZLV) / (P5D-M
5D)} × 10 ° when the calculation at the same time as converting the sensor output value at zero adjustment in step S ₄ to Ta ° C., pre-tilt angle of -5 °, + 5 sensor output value in ° Is converted from the reference temperature to Ta ° C.

[0050] Further, the output as compared with the temperature corrected sensor output values for the inclination angle θ read from the output characteristic graph of FIG. 8, and the sensor output value before correction, measured at Ta ° C. Step S ₈ Find the value error. The error of this output value is obtained in advance as data as shown in FIG. 9 for various inclination angles, and when the error obtained by the above comparison matches the correction data, there is no need for correction. If the errors do not match, the inclination angle θ is corrected according to the output value corresponding to the error deviation (step S ₁₀ ). And displays it in step S _10.

The values obtained by correcting the inclination angle θ with respect to the temperature, the zero point, and the linearity in this way are extremely accurate. In this embodiment, the inclination angle sensitivity of 0.01 ° or less within the range of ± 6 ° of the inclination angle. Things were obtained.

The tilt measuring device of the above embodiment is applied as follows. The application example shown in FIG. 12 will be briefly described.

Numeral 21 denotes a lightwave ranging finder, which generates a lightwave of a predetermined wavelength, receives a lightwave returned from a reflection mirror installed on an object to be measured at a predetermined distance, and receives the lightwave by a phase difference of the lightwave. This is a device that obtains time and thereby measures the distance to the object to be measured, and is generally used for civil engineering, construction, and surveying.

The signal indicating the distance from the lightwave distance meter 21 is sent to the personal computer 28 together with the signals from the inclination sensors 3 and 4 of the inclination measuring device 27 described above. The personal computer 28 includes a keyboard, a central processing unit, a storage unit, a display, a printer, and the like.

As shown in FIG.
Is installed at an arbitrary position with respect to the four legs of the tower structure,
The inclination measuring device 27 is sequentially attached to each leg 23, and a diagonal dimension, a diagonal diagonal distance, a diagonal diagonal distance, a height difference, and the like of each leg are measured. The tilt angle is measured. 22 is a reflection mirror, 24 is an installation adjustment stand, 25 is a support, 26 is a cutting hole, and 29 is a communication line.

The illustrated leg member 23 is installed in a digging hole 26 that has been previously digged to an approximate position on a slope such as a mountain or a valley.
The tilt angle is also set at an approximate position and angle, and the installation state is determined by the lightwave distance measuring instrument 21 and the tilt measuring device 27.
, The installation state is confirmed in the unit of mm, the error of the installation position is calculated in the computer, and the error data is displayed. Based on the data, the leg 23 is installed and adjusted to the correct position.

In the installation adjustment of the leg material, since the measured value of the inclination angle obtained by the calculation only by the measurement using the lightwave distance measuring instrument 21 has a large error, the inclination angle value directly measured by the inclination measuring device for the position adjustment. Is used.

In the above embodiment, the tilt sensor used in the tilt measuring device is of a type in which a magnetoresistive element (MR element) and a magnet are combined, but other types are used. It goes without saying that any device having the same function of measuring the inclination angle can be used.

FIG. 13 shows a method of detachably fixing the tilt angle sensor by other means. In the first embodiment, the inclination angle sensor is mounted on the outer peripheral surface of the post near the top of the leg using the magnetic base. However, in this embodiment, the inclination sensor can be stably mounted on the top flange of the leg A. As described above, the sensor mounting base 1 is used so as to be detachably fixed.

As shown in FIG. 15, in the sensor mounting base 1, a fixed seat 1c is fixed to the base plate 1a,
° inclined surface. Further, the inclination angle sensors 3 and 4 are provided side by side in a case 2 fixed to a base plate 2a detachably mounted thereon with screws 2b. As shown in the figure, the sensor mounting base 1 is composed of cruciform base plates 1a and 1b, and the length of 1a is determined according to the maximum diameter expected as a post flange of the leg material A to be measured (for example, The maximum diameter is 800φ and the minimum diameter is 300φ). Base plate 16
Is for lateral stability.

The measurement signals from the inclination angle sensors 3 and 4 are sent to the computer 14 by a cord 8 connected to a terminal 7a fixed to the case 2 via a connector 7b. The inclination angle sensors 3 and 4 are 9
Since the sensor mounting base 1 is mounted on the top of the post flange inclined at 9 °, the center lines of the tilt angle sensors 3 and 4 become vertical.

As shown in FIG. 13, the sensor mounting base 1 is mounted to the top of the post flange at both ends via mountings 9. As shown in the figure, the mounting member 9 is formed in a vise-like shape, and the length of the U-shaped holding member 9a is adjusted with a knob 9b and tightened to fix the mounting table 1.

The tilt angle sensor is fixed by the tilt angle sensor fixing means configured as described above, and the tilt angle is measured. The above-described sensor mount 1 is placed on the top of the post flange of the leg material A to be measured, and is fixed by the mount 9.
Prior to installing the sensor mount 1, the inclination sensors 3, 4 are subjected to a calibration test in a horizontal place in advance.

This calibration test is a test for checking whether horizontal and vertical degrees are secured including the base plate 2a to which the case 2 for mounting the inclination sensors 3 and 4 is fixed. A level is mounted on a reference base on which is mounted as a test, thereby strictly adjusting the reference state of the sensor (a calibration test apparatus is not shown).

An accurate measurement of the tilt angle can be performed only by mounting the sensor mount 1 on the top of the leg material A with the tilt sensors 3 and 4 having completed the calibration test. The method of measuring the inclination angle is exactly the same as in the first embodiment.

[0066]

As described in detail above, the tilt measuring device according to the first invention of the present application includes two tilt angle sensors in a storage case.
Inside, and the storage case can be
The two sensors are mounted by combining the measuring surfaces including their vertical axes at right angles to each other, and the vertical axis is the inclination angle of the mounting surface.
Temperature sensor and linearity
The output correction circuit that corrects the error has an advantage that the tilt angle sensor can measure a sufficiently accurate tilt angle even with a general configuration in which the accuracy of the tilt angle sensor decreases as the tilt angle increases. Is obtained.

According to the second aspect of the present invention, since the tilt angle sensor is constituted by a combination of a magnetoresistive element and a magnet, the configuration of the tilt measuring device is extremely simple and easy to handle. And accurate angle measurement is possible.

[0068] In a third aspect of the invention, large temperature coefficient of the magneto-resistive element is, since the occurrence of errors due to changes in angle and temperature so as to correct the correction circuit, to maintain the measurement accuracy of the measuring device very high and construction Has many advantages that it is easy to handle because of its simplicity and can be obtained at economical cost.

According to the fourth aspect of the present invention, the inclination sensor is mounted on the top flange of the leg material through the sensor mounting device which can be mounted so as to coincide with the predetermined rolling angle. The angle can be accurately measured simply by placing it on a simple mounting fixture. It is an extremely suitable means for severe environmental conditions at the installation site of a steel tower, and is effective for improving the efficiency of measurement work.

[Brief description of the drawings]

FIG. 1 is a schematic side view of an inclination measuring device.

FIG. 2 is a front view of the same.

FIG. 3 is a functional diagram of a tilt sensor.

FIG. 4 is an explanatory diagram of a use range of a tilt sensor.

FIG. 5 is a schematic block diagram of an inclination measuring device.

FIG. 6 is a partial block diagram of FIG. 5;

FIG. 7 is a flowchart illustrating an operation.

FIG. 8 is a chart of outlet voltage characteristics.

FIG. 9 is a chart of base point linearity.

FIG. 10 is a graph showing temperature characteristics of output.

FIG. 11 is a table of resistance temperature characteristics of a magnetoresistive element.

FIG. 12 is an explanatory view of an application method to installation of a tower leg material.

FIG. 13 is an overall schematic view of another embodiment of the inclination angle sensor mounting means.

FIG. 14 is a plan view of the above.

FIG. 15 is an enlarged perspective view of the same.

FIG. 16 is an explanatory view of a conventional steel tower leg material installation state.

FIG. 17 is an explanatory view of a conventional method of installing a steel tower leg material.

FIG. 18 is an explanatory view of installation dimensions of steel tower leg materials.

FIG. 19 is an explanatory view of a problem at the time of installing a tower leg material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Attachment member 2 Case 3 and 4 Tilt sensor 5 Handle 6 Magnetic base

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Shiro Matsuo 2-34 Honjo Higashi, Kita-ku, Osaka Kindennai Co., Ltd. (56) References JP-A-60-151508 (JP, A) −170401 (JP, U) Actually open sho 57-50009 (JP, U)

Claims (4)

(57) [Claims] A pair of tilt angle sensors for outputting a signal proportional to an angle are provided in a storage case.
Attach to the elephant with the preset inclination angle mounting surface
The two sensors have an inclination measuring surface including a vertical axis perpendicular to each other , and the vertical axis corresponds to the inclination angle of the mounting surface.
Provided to killing, the error of each sensor temperature and linearity
A tilt measuring device configured to have an output correction circuit for correcting . 2. The tilt angle sensor comprises two magnetoresistive elements and a magnet combined with the magnetoresistive element. When a magnet provided movably in both forward and reverse directions moves in proportion to the angle, the magnet corresponds to the amount of movement. The tilt measuring device according to claim 1, wherein the tilt measuring device is configured to output a signal. 3. An output correction circuit of the tilt angle sensor corrects a zero point at the time of zero tilt angle adjustment from a reference temperature to a value at a measurement temperature, and previously measures an error based on a temperature of the output value at the measurement temperature. 3. The tilt measuring device according to claim 2, comprising a temperature correction unit that corrects with data, and a linearity correction unit that corrects a linearity error with data measured in advance. 4. A fixed seat for fixing a case accommodating the two tilt angle sensors, and a sensor mount fixed integrally with the fixed seat and having a length substantially corresponding to a maximum diameter of the object to be measured. 4. The fixed seat according to claim 1, further comprising a sensor mounting device, wherein the fixed seat is formed such that an angle formed between an upper surface of the fixed seat and a lower surface of the sensor mounting base is a predetermined inclination angle with respect to the rolling angle. 4. The tilt measuring device according to claim 1.