JPH0843103A - Measuring equipment for sensitivity of angular velocity sensor - Google Patents

Abstract

PURPOSE:To execute the measurement quickly by a simple structure, to improve productivity of an angular velocity sensor and to enable reduction of the cost of production by providing a fitting base and a driving part making the fitting base rotate in normal and reverse directions repeatedly. CONSTITUTION:A fitting face 12a of a fitting base 12 of an angular velocity sensor 11 to be measured is made horizontal practically and this fitting base 12 is made to rotate at a minute angle >=theta in normal and reverse directions repeatedly by a driving part 13 around the axis 14 being parallel to the fitting face 12a. Therefore, the fitting face 12a is always directed in the vertical direction virtually. On the occasion of regulation of the sensitivity of the sensor 11 fitted on the fitting face 12a, accordingly, the operation of regulation can be executed without stopping once equipment, and execution of the regulation in a short time and consequent reduction of the cost of production are made possible. Besides, a power supply line and a signal output line can be connected to the sensor 11 without using a slip ring or the like. Accordingly, a structure can be made simple, generation of noise is eliminated, the sensitivity of the sensor 11 can be measured quickly and an improvement of the productivity of the sensor 11 and reduction of the cost of production are made possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the sensitivity of an angular velocity sensor, and more particularly to an apparatus for measuring the sensitivity of an angular velocity sensor that can quickly measure the detection sensitivity of mass-produced angular velocity sensors.

[0002]

2. Description of the Related Art Conventionally, when measuring the sensitivity of an angular velocity sensor, as shown in FIG. 7, an angular velocity to be measured is mounted on a disk-shaped mount 2 which is rotatable about a rotary shaft 1 in a substantially vertical direction. The sensor 3 is attached, and the detection sensitivity of the angular velocity sensor 3 is measured while the mount 2 is rotated in the normal direction or inverted at a constant speed in a substantially horizontal plane about the rotation axis 1.

[0003]

However, in order to measure the sensitivity of the angular velocity sensor, the angular velocity sensor must be supplied with power and the output from the angular velocity sensor must be measured. When the angular velocity sensor 3 is mounted on the mounting base 2 and rotated, it is necessary to supply power and take out signal output via a slip ring or the like in order to prevent twisting of the power supply line and the signal output line due to rotation. There is. For this reason, there is a problem that the structure becomes complicated and a contact failure or noise occurs due to a slip ring or the like.

When adjusting the sensitivity of the angular velocity sensor 3 during measurement, the rotation of the mounting base 2 is temporarily stopped and
For example, it is necessary to change the amplification degree of the detection amplifier provided in the angular velocity sensor 3 by a volume or the like incorporated in the detection amplifier, and then rotate the mounting base 2 again to perform the measurement. It will take a long time. Therefore, there is a problem that the productivity of the angular velocity sensor is reduced and the production cost is increased.

The present invention has been made by paying attention to such a conventional problem, and has a simple structure and can perform quick measurement. Therefore, the productivity of the angular velocity sensor can be improved and the production cost can be reduced. An object of the present invention is to provide an appropriately configured angular velocity sensor sensitivity measuring device.

[0006]

In order to achieve the above object, the sensitivity measuring device for an angular velocity sensor according to the present invention comprises a mounting base having a substantially horizontal mounting surface for mounting an angular velocity sensor to be measured, and the mounting base described above. And a drive unit that repeatedly rotates in forward and reverse directions about an axis substantially parallel to the mounting surface.

The drive unit includes a rotating machine that repeatedly rotates the mounting table in forward and reverse directions, a first pulse signal generator that generates a first pulse signal for frequency sweeping, and the first unit.
A second pulse signal generator for generating a second pulse signal having a higher frequency than that of the pulse signal, and based on the first pulse signal, rotation of the mounting table in the forward and reverse directions by the rotating machine. The moving direction and the cycle are controlled, and the rotation speed of the mounting table by the rotating machine is controlled based on the second pulse signal.

The drive unit includes a rotating machine having a forward rotation input terminal and a reverse rotation input terminal for repeatedly rotating the mounting base in forward and reverse directions, and a first pulse signal for generating a first pulse signal for frequency sweeping. A generator, a second pulse signal generator that generates a second pulse signal having a higher frequency than the first pulse signal, and a first pulse signal that combines the first pulse signal and the second pulse signal A first synthesizing circuit, an inverting circuit that inverts the first pulse signal, and a second synthesizing circuit that synthesizes the output signal of the inverting circuit and the second pulse signal. The output of the synthesis circuit is supplied to the forward rotation input terminal or the reverse rotation input terminal of the rotating machine, and the output of the second synthesis circuit is supplied to the reverse rotation input terminal or the forward rotation input terminal of the rotating machine. , Repeatedly rotating the rotating machine in forward and reverse directions It is characterized in that it has configured.

[0009]

In the present invention, the mounting base for mounting the angular velocity sensor to be measured has a substantially horizontal mounting surface, and is repeatedly rotated in the forward and reverse directions by the drive unit about an axis substantially parallel to the mounting surface. Therefore, the power supply line for supplying power to the angular velocity sensor and the signal output line for extracting the output from the angular velocity sensor can be directly connected to the angular velocity sensor without using a slip ring or the like. Become. Therefore, the structure becomes simple,
No noise is generated.

Further, since the mounting base repeatedly rotates in the forward and reverse directions about an axis substantially parallel to the substantially horizontal mounting surface, the mounting surface always faces the vertical direction.
Therefore, when adjusting the sensitivity of the angular velocity sensor mounted on the mounting surface, it is possible to perform the adjustment work without temporarily stopping the device, so that the adjustment can be performed in a short time and the production cost can be reduced. Becomes

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 (A) and 1 (B) are a side view and a front view showing a first embodiment of the present invention. In this embodiment, the mount 12 for the angular velocity sensor 11 to be measured is used.
The mounting surface 12a is substantially horizontal, and the mounting base 12 is repeatedly rotated about the axis 14 parallel to the mounting surface 12a by the drive unit 13 in the forward and reverse directions at the minute angle Δθ. . Therefore, the mounting surface 12a
Will always face almost vertically.

2 (A) and 2 (B) are a side view and a front view showing a modified example of the first embodiment.
In order to prevent the centrifugal force from acting on the angular velocity sensor 11 when the angular velocity sensor 11 is repeatedly rotated, the rotation center shaft 14 of the mounting base 12 is set substantially at the center of the angular velocity sensor 11 installed on the mounting surface 12a. It was made to pass through. Also in this case, the mounting surface 12a always faces almost the vertical direction.

FIG. 3 shows a second embodiment of the present invention. This embodiment is similar to the first embodiment except that the drive unit 1
3, a rotary machine 15 for repeatedly rotating the mounting base 12 in forward and reverse directions about a shaft 14, a first pulse signal generator 16 for generating a first pulse signal for frequency sweeping, and a first pulse signal generator 16 for the first pulse signal. A second pulse signal generator 17 for generating a second pulse signal having a frequency higher than that of the pulse signal is provided, and the first pulse signal and the second pulse signal are supplied to the rotating machine 15 to generate the first pulse signal. The rotation direction and the cycle of the mounting base 12 by the rotating machine 15 are controlled based on the pulse signal,
The rotation speed of the mounting base 12 by the rotating machine 15 is controlled based on the second pulse signal.
As the rotating machine 15, for example, a servo motor, a stepping motor, or the like is used, and the rotation direction and cycle are internally controlled based on the first pulse signal, and the rotation speed is controlled based on the second pulse signal. A drive circuit for controlling is provided.

That is, in this embodiment, as the first pulse signal, a signal in which the frequency sweep is repeated at a specific time interval is output, and the rotation of the rotating machine 15 is rotated in the forward and reverse directions depending on the level of the signal level. And the cycle of the repetitive rotation is made to correspond to the frequency of the first pulse signal. Also,
The rotation speed of the rotating machine 15 is made to correspond to the frequency of the second pulse signal.

FIG. 4 shows a third embodiment of the present invention. In this embodiment, for example, a servomotor, a stepping motor or the like having a forward rotation input terminal 18 and a reverse rotation input terminal 19 is used as the rotating machine 15 in the second embodiment. In addition, as shown in FIG. 5A, the first pulse signal generator 16 outputs a first pulse signal in which frequency sweep is repeated at specific time intervals, and the second pulse signal generator 17 outputs the first pulse signal. Then, as shown in FIG. 5B, a second pulse signal having a higher frequency than the first pulse signal and a constant cycle is output.

The first pulse signal and the second pulse signal are supplied to the OR circuit 20 to obtain a composite signal shown in FIG. 5C, and the composite signal is supplied to the normal input terminal 18 of the rotating machine 15.
Supply to. In addition, the first pulse signal is the inverter 2
1 and inverts the output signal of the inverter 21 and the second pulse signal to the OR circuit 22 to obtain the combined signal shown in FIG. 5 (D).
5 to the reverse rotation input terminal 19.

Therefore, the rotating machine 15 keeps the second input signal while the second pulse signal is being supplied to the normal input terminal 18.
Forward rotation at a speed according to the frequency of the pulse signal of, and while the second pulse signal is being supplied to the reverse input terminal 19, reverse rotation at a speed according to the frequency of the second pulse signal, The forward and reverse rotation cycles are synchronized with the height of the first pulse signal.

When measuring the sensitivity of the angular velocity sensor 11 mounted on the mounting base 12, the rotating machine 15 is used.
To a frequency-voltage converter (F-V) 24 and a flip-flop circuit (FF) 25 to detect the rotation speed and the rotation direction. , These outputs the multiplier 2
Multiply by 6 to get the analog reference output. This reference output is, for example, FF together with the detection output of the angular velocity sensor 11.
It is supplied to an amplitude and phase measuring device 27 composed of a T-analyzer or the like, where the excess or deficiency of the detection output with respect to the reference output is measured, the detection sensitivity of the angular velocity sensor 11 is measured, and the sensitivity adjustment is performed based on this. FIGS. 6A and 6B show an example of measurement results of the amplitude characteristic and the phase characteristic thus measured.

In FIG. 4, the output of the OR circuit 20 is supplied to the normal input terminal 18 and the output of the OR circuit 22 is supplied to the reverse input terminal 19, respectively.
Even if the output of the circuit 22 is supplied to the normal input terminal 18 and the output of the OR circuit 20 is supplied to the reverse input terminal 19, the operation is similar. Therefore, instead of the OR circuits 20 and 22, AND circuits may be used to perform the same operation.

[0020]

According to the present invention, the mounting base having the substantially horizontal mounting surface for mounting the angular velocity sensor to be measured is repeatedly rotated in the forward and reverse directions about the axis substantially parallel to the mounting surface. Therefore, the power supply line and the signal output line can be connected to the angular velocity sensor without using a slip ring or the like. Therefore, the structure can be simplified, and the sensitivity of the angular velocity sensor can be measured and adjusted quickly and easily without generating noise, so that the productivity of the angular velocity sensor can be improved and the production cost can be reduced. .

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a modification of the first embodiment.

FIG. 3 is a diagram showing a second embodiment of the present invention.

FIG. 4 is likewise a diagram showing a third embodiment.

FIG. 5 is a diagram showing a signal waveform of each part of the third embodiment.

FIG. 6 is a diagram showing an example of measurement results according to a third embodiment.

FIG. 7 is a diagram for explaining a conventional technique.

[Explanation of symbols]

 11 Angular Velocity Sensor 12 Mounting Base 12a Mounting Surface 13 Drive Unit 14 Shaft 15 Rotating Machine 16 First Pulse Signal Generator 17 Second Pulse Signal Generator

Claims (3)

[Claims] 1. A mounting base having a substantially horizontal mounting surface for mounting an angular velocity sensor to be measured, and a drive unit for repeatedly rotating the mounting base in forward and reverse directions about an axis substantially parallel to the mounting surface. An angular velocity sensor sensitivity measuring device having. 2. The drive unit, a rotating machine that repeatedly rotates the mounting table in forward and reverse directions, a first pulse signal generator that generates a first pulse signal for frequency sweeping, and the first A second pulse signal generator for generating a second pulse signal having a frequency higher than that of the pulse signal, and rotation of the mount in forward and reverse directions by the rotating machine based on the first pulse signal. Control direction and cycle,
The sensitivity measuring device for an angular velocity sensor according to claim 1, wherein the rotational speed of the mounting base by the rotating machine is controlled based on the second pulse signal. 3. The drive unit includes a rotating machine having a forward rotation input terminal and a reverse rotation input terminal for repeatedly rotating the mounting base in forward and reverse directions, and a first pulse signal for generating a frequency-swept first pulse signal. A pulse signal generator, a second pulse signal generator that generates a second pulse signal having a frequency higher than that of the first pulse signal, and a combination of the first pulse signal and the second pulse signal. A first synthesizing circuit, an inverting circuit that inverts the first pulse signal, and a second synthesizing circuit that synthesizes the output signal of the inverting circuit and the second pulse signal. The output of the first combination circuit is supplied to the forward rotation input terminal or the reverse rotation input terminal of the rotary machine, and the output of the second combination circuit is supplied to the reverse rotation input terminal or the forward rotation input terminal of the rotary machine. Then, the rotating machine is repeatedly rotated in the forward and reverse directions. Sensitivity measuring device of an angular velocity sensor according to claim 1, characterized by being configured so as to.