JPH08313262A - Optical fiber gyroscope automatic test equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] The measurement error due to noise caused by the sliding of the rate table slip ring and the brush is reduced, and the voltage of the FOG caused by the voltage drop due to the long signal path. (EN) Provided is an FOG automatic test device in which a measurement error of an output signal is also reduced. The optical fiber gyroscope 4 to be tested and measured is mounted on the table top 12 of the rate table 1, and a V / F converter 23 for processing a signal output from the optical fiber gyroscope 4 is installed.
An optical fiber gyroscope automatic tester in which a signal processing unit 2 including down counters 20 and 24 and memories 22 and 25 is also mounted on a table top 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber gyroscope automatic test apparatus, and more particularly, to an optical fiber gyroscope with a small voltage drop due to a cable length when measuring an analog voltage signal and a measurement error due to a noise of a rate table slip ring. Scope automatic test equipment.

[0002]

2. Description of the Related Art A conventional example of an optical fiber gyroscope automatic test apparatus (hereinafter, referred to as FOG automatic test apparatus) will be described with reference to FIGS. FIG. 2 shows a conventional example of an FOG automatic test device. FIG. 3 shows a rate table on which the FOG is mounted. In these figures, 1 is a rate table. Reference numeral 11 denotes a cylindrical rotary shaft that is driven to rotate at a high speed, and a disk-shaped table top 12 is fixed to the cylindrical rotary shaft 11. Reference numeral 13 denotes a connector attached to the table top 12. Reference numeral 14 denotes a slip ring holder formed of a cylinder, and a plurality of annular slip rings 15 are formed on the surface thereof in the axial direction of the holder. The slip ring holder 14 and the cylindrical rotary shaft 11 are coaxially arranged. The cylindrical rotary shaft 11 rotates at high speed as described above, whereas the slip ring holder 14 is fixed without rotating. Reference numeral 16 denotes a brush, which is elastically fixed to the cylindrical rotary shaft 11 that is driven to rotate at high speed, while the tip of the brush contacts and slides with the annular slip ring 15 formed on the slip ring holder 14. FIG. 2 shows a total of 6 FOGs 4 to be tested and measured at the same time. These are table tops 1 of this rate table 1.
2 is mounted and mounted on the table 2, and the table top 12 is rotated at a high speed for test measurement.

Reference numeral 2 is a signal processing section, which comprises an up / down counter 20 and a digital voltmeter 21.
Reference numeral 32 is a personal computer that constitutes an arithmetic processing unit.
One set of the signal processing unit 2 including the up / down counter 20 and the digital voltmeter 21 is provided for each of the six FOGs 4. The signal processing unit 2 and the arithmetic processing unit 32 are not placed and attached to the table top 12, but are installed on the main body side of the rate table 1.

Here, the FOG 4 is mounted on and mounted on the table top 12 of the rate table 1.
The output signal obtained by rotating at a high speed reaches the connector 13 attached to the table top 12 through the signal cable 5 from the output end of the FOG 4, and the brush 16 fixed to the cylindrical rotary shaft 11 that is driven to rotate at a higher speed. It is sent through the signal cable 6. The output signal sent to the brush 16 then goes up / down of the signal processing unit 2 installed on the main body side of the rate table 1 via the annular slip ring 15 and the signal cable 7 with which the brush 16 makes contact and slides. Counter 20 or digital voltmeter 21
Is input to

When the type of signal output from the FOG 4 is a pulse signal, this pulse signal is referred to as a signal cable 5, a connector 13, a signal cable 6, a brush 16, an annular slip ring 15 and a signal cable 7 from the output end of the FOG 4. It is input to the up / down counter 20 of the signal processing unit 2 through the signal path, measured, and transmitted to the personal computer 32 according to the general-purpose measuring instrument digital communication standard (GPIB). Here, the measured value is arithmetically processed to evaluate the FOG 4. .

When the type of the signal output from the FOG 4 is a voltage signal, the voltage output signal is similarly output from the output end of the FOG 4 to the signal cable 5, the connector 13, the signal cable 6, the brush 16, the annular slip ring 15, and the signal. It is input to the digital voltmeter 21 of the signal processing unit 2 via the signal path of the cable 7 and is measured and transmitted to the personal computer 32 according to the general purpose digital communication standard (GPIB). Here, the measured value is arithmetically processed to evaluate the FOG 4 I do.

[0007]

The FOG automatic test apparatus including the rate table 1, the up / down counter 20 and the digital voltmeter 21 has the following drawbacks. First, the pulse signal output from the FOG 4 is transmitted to the signal processing unit 2 via the signal path as described above and processed. Since the brush 16 and the annular slip ring 15 are present in this signal path, a large amount of noise is generated due to the sliding of the brush 16 and the annular slip ring 15, and this noise is caused by the FOG.
It is mixed in the pulse output signal of No. 4 to increase the measurement error.

When the signal output from the FOG 4 is a voltage signal, the signal cable 5 and the connector 1 described above are used.
3, the signal path formed by the signal cable 6, the brush 16, the annular slip ring 15, and the signal cable 7 is relatively long, and the measurement error increases due to the voltage drop of the long cable. Furthermore, the noise generated due to the sliding of the brush 16 and the annular slip ring 15 increases the measurement error even in the case of the voltage output signal.

When the number of FOGs 4 mounted on the table top 12 of the rate table 1 increases, the input / output signals increase in proportion to this. Corresponding to this increase, the number of annular slip rings 15 and brushes 16, the number of up / down counters 20 and the number of digital voltmeters 21 also increase. The present invention provides an optical fiber gyroscope automatic test apparatus which solves the above problems.

[0010]

The optical fiber gyroscope 4 to be tested and measured is mounted on the table top 12 of the rate table 1, and the V / F conversion for processing the signal output from the optical fiber gyroscope 4 is performed. The table top 1 also includes the signal processing unit 2 including the container 23, the up / down counters 20 and 24, and the memories 22 and 25.
An optical fiber gyroscope automatic test device mounted on and mounted in No. 2 was constructed.

Then, the signal processing section 2 includes a buffer circuit 26.
And an optical fiber gyroscope automatic tester that outputs a measurement signal via the buffer circuit 26. In addition, an optical fiber gyroscope automatic test apparatus that outputs the measurement signal to the arithmetic processing unit 3 installed on the main body side of the rate table 1 was configured.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIG. Reference numeral 1 denotes a rate table, which has substantially the same configuration as the rate table used in the conventional example. However, two pairs of the brush 16 and the annular slip ring 15 are formed corresponding to the address bus 8 and the data bus 9.

The signal processing unit 2 has an up / down counter 20 to which a pulse signal is input from the FOG 4 and a memory 22 for storing the counting result. The signal processing unit 2 further includes a V / F converter 2 to which a voltage signal is input from the FOG 4.
3. It has an up / down counter 24 for counting the frequency measured by the V / F converter 23 and a memory 25 for storing the counting result. 26 is a buffer circuit.

In the conventional example, the signal processing unit 2 was installed on the main body side of the rate table 1, but in the embodiment of the present invention, the signal processing unit 2 is also mounted on the table top 12 together with the FOG 4. An arithmetic processing unit 3 arithmetically evaluates the measured value of the signal processing unit 2 and includes a parallel I / O module 31 and a personal computer 32. Only the arithmetic processing unit 3 is installed on the main body side of the rate table 1.

The operation of the FOG automatic test equipment of the present invention will now be described. First, when a pulse output signal is input from the FOG 4 to the up / down counter 20 of the signal processing unit 2, the up / down counter 20 counts the number of input pulses. This counting pulse signal is stored in the memory 22 at regular intervals. The counting pulse signal stored in the memory 22 at regular intervals is sent to the buffer circuit 26 via the address bus 8 and the data bus 9. The counting pulse signal temporarily stored in the buffer circuit 26 is the cable 5, the connector 13, the signal cable 6, and the brush 1.
6, a general-purpose measuring instrument digital communication standard (G) via a signal path composed of an annular slip ring 15 and a signal cable 7.
PIB) is transmitted to the arithmetic processing unit 3, and the parallel I /
The O-module 31 and the personal computer 32 perform read-out arithmetic processing to evaluate the FOG 4.

From the FOG 4 to V / of the signal processing unit 2
When the voltage output signal is input to the F converter 23, the V / F converter 23 converts this voltage signal into a frequency signal, and this frequency signal is then input to the up / down counter 24 and counted. This counting pulse signal is stored in the memory 2 at regular intervals.
5 is stored. The count pulse signal stored in the memory 25 at regular intervals is sent to the buffer circuit 26 via the address bus 8 and the data bus 9. The counting pulse signal temporarily stored in the buffer circuit 26 is passed through the signal path formed by the cable 5, the connector 13, the signal cable 6, the brush 16, the annular slip ring 15 and the signal cable 7, and is a general-purpose measuring instrument digital communication standard. (GPIB)
By the parallel I / O module 31 and the personal computer 32 to perform arithmetic processing to evaluate the FOG 4.

Here, also in the embodiment of the present invention as described above, the pulse count signal stored in the memory 22 or the memory 25 is transmitted to the arithmetic processing unit 3 via the slip ring 15 and the brush 16, and the parallel I / O module 31
And the place where the data is read out and evaluated by the personal computer 32 is the same as the conventional example. However, since the output signal of the FOG 4 is measured without passing through the slip ring 15 and the brush 16, the slip ring 1 for the measurement signal itself is measured.
The influence of noise generated due to the sliding of the brush 5 and the brush 16 is extremely small, and a measurement signal with a small measurement error can be obtained.

Then, the slip ring 1 in the signal path
5 and the insertion of the buffer circuit 26 in the preceding stage of the brush 16, the influence of the noise generated due to the sliding of the slip ring 15 and the brush 16 on the measurement signal itself is minimized, and the measurement signal with a small measurement error is obtained. Can be obtained. In addition, the influence of the voltage drop due to the long signal path, which is a problem when the signal output from the FOG 4 is a voltage signal, is F before the buffer circuit 26.
The voltage output signal of the OG4 is measured, and in this measurement, the long signal path from the buffer circuit 26 to the arithmetic processing unit 3 installed on the main body side of the rate table 1 becomes irrelevant, so it is possible to eliminate this. it can.

The FOG automatic test apparatus according to the present invention has 25 channels of the signal processing section 2 and can easily test and measure 25 FOGs at the same time.

[0020]

As described above, according to the present invention,
The FOG to be tested and measured is mounted on the table top of the rate table, and the signal processing unit for processing the signal output from the FOG is also mounted on the table top. Provided is an FOG automatic test apparatus which reduces a measurement error due to noise caused by sliding and also reduces a measurement error of a voltage output signal of an FOG caused by a voltage drop due to a long signal path. I was able to.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an example.

FIG. 2 is a perspective view of a rate table.

FIG. 3 is a diagram illustrating a conventional example.

[Explanation of symbols]

 1 rate table 12 table top 2 signal processing unit 20 up / down counter 22 memory 23 V / F converter 24 up / down counter 25 memory 26 buffer circuit 3 arithmetic processing unit 4 optical fiber gyroscope

Claims (3)

[Claims] 1. A V / F converter, an up / down counter, and a memory for mounting an optical fiber gyroscope to be tested and measured on a table top of a rate table and processing a signal output from the optical fiber gyroscope. An optical fiber gyroscope automatic test device, characterized in that a signal processing unit consisting of is also mounted on the table top. 2. The optical fiber gyroscope automatic test apparatus according to claim 1, wherein the signal processing unit includes a buffer circuit, and the measurement signal is output via the buffer circuit. Fiber gyroscope automatic test equipment. 3. The optical fiber gyroscope automatic test apparatus according to claim 1 or 2, wherein the measurement signal is output to an arithmetic processing unit installed on the main body side of the rate table. An optical fiber gyroscope automatic tester characterized by the fact that