CN216792270U

CN216792270U - Multi-accelerometer calibration device

Info

Publication number: CN216792270U
Application number: CN202123186031.5U
Authority: CN
Inventors: 吕琦; 蔡晨光; 刘志华; 夏岩
Original assignee: National Institute of Metrology
Current assignee: National Institute of Metrology
Priority date: 2021-12-17
Filing date: 2021-12-17
Publication date: 2022-06-21
Anticipated expiration: 2031-12-17

Abstract

The utility model discloses a multi-accelerometer calibration device which comprises a standard intermediate frequency vibration table, a standard intermediate frequency accelerometer, a calibrated intermediate frequency accelerometer, a power amplifier, a voltage signal output device, a collecting and transmitting device and a processing and display unit. The standard intermediate frequency vibration table provides excitation acceleration of a standard intermediate frequency accelerometer and a calibrated intermediate frequency accelerometer, and the power amplifier excites the vibration table by increasing the power of excitation voltage; a calibrated sensor is fixed on the table top at the fixed position of each standard sensor; the voltage signal acquisition and transmission equipment acquires output voltage signals of a transmission standard intermediate frequency accelerometer and a calibrated intermediate frequency accelerometer; the processing and displaying unit processes the output voltage signal and stores and displays the sensitivity calibration result of the calibrated intermediate frequency accelerometer. The utility model has the advantages of simple calibration process, short time and capability of calibrating a plurality of sensors simultaneously.

Description

Multi-accelerometer calibration device

Technical Field

The utility model belongs to the field of vibration calibration, is suitable for simultaneously calibrating a plurality of sensors, and particularly relates to a multi-accelerometer calibration device.

Background

The vibration sensor is widely applied to dynamic load tests and fatigue tests of structures such as machinery and electric power, and due to the fact that sensitivity of the sensors in the same batch is different in the processing and production process, the sensors are aged due to the fact that the sensors are used for too long time, the sensitivity of the sensors is affected, and even the sensors are damaged, and therefore the accelerometer needs to be periodically calibrated.

The existing accelerometer calibration system can only calibrate a single accelerometer, mass accelerometers can only be calibrated one by one during calibration, repeated installation is needed for multiple times, the uncertainty of calibration is increased due to repeated installation for multiple times, a large amount of time and labor are wasted, multiple standard intermediate frequency accelerometers are installed on a table board, a threaded hole is placed at each corresponding position under the table board, the accelerometer is calibrated during installation, the excitation acceleration of a vibration table at each position in the vibration process is different, but the excitation acceleration at the same position is the same, and the simultaneous calibration of multiple accelerometers can be completed.

SUMMERY OF THE UTILITY MODEL

The utility model provides the multi-accelerometer calibration device which has low cost, simple operation, low calibration environment requirement and high whole measurement range precision; the device can be used for calibrating the accelerometer in a large batch.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a multi-accelerometer calibration device comprises a standard intermediate frequency vibration table 1, a standard intermediate frequency accelerometer 2, a calibrated accelerometer 6, a power amplifier 3 and a voltage signal output, acquisition and transmission device 4.

The standard intermediate frequency vibration table 1 is used for providing a standard intermediate frequency excitation signal and comprises a vibration table top and a rotary base, wherein the vibration table top is arranged on the rotary base; a plurality of calibrated intermediate frequency accelerometers 6 are arranged below the vibration table top, and a standard intermediate frequency accelerometer 2 is arranged on the vibration table top; the rotating base can adjust the vibration direction and provide standard excitation signals for different types of accelerometers; the standard intermediate frequency accelerometer 2 is connected with a voltage signal output, acquisition and transmission device 4; the voltage signal output, acquisition and transmission equipment 4 is connected with the rotating base through a power amplifier 3.

Furthermore, a threaded hole is arranged below the vibration table board, and the calibrated accelerometer 6 is installed in the threaded hole through threads.

Further, the voltage signal output, acquisition and transmission device 4 is connected with the processing and display unit 5.

Further, the standard intermediate frequency accelerometer 2 is used for measuring a standard intermediate frequency excitation signal, and the obtained excitation signal is used for measuring the sensitivity of the calibrated intermediate frequency accelerometer.

Further, the calibrated intermediate frequency accelerometer 6 is used as a measured object, and the sensitivity of the calibrated accelerometer is obtained by measuring the standard intermediate frequency accelerometer 2 and the calibrated intermediate frequency accelerometer 6.

Further, the power amplifier 3 is configured to amplify the power of the output voltage signal, and excite the vibration table to generate an excitation amplitude.

Further, the voltage signal output, acquisition and transmission device 4 is used for outputting a standard sine signal, and acquiring and transmitting output voltage signals of the standard intermediate frequency accelerometer and the calibrated intermediate frequency accelerometer.

Further, the processing and displaying unit 5 is configured to process and store the acquired signals of the standard intermediate frequency accelerometer and the calibrated intermediate frequency accelerometer, so as to obtain the sensitivity of the calibrated accelerometer.

Compared with the prior art, the standard intermediate frequency vibration table designed by the utility model can be provided with a plurality of calibrated accelerometers, and corresponding standard excitation signal output is carried out on the corresponding standard intermediate frequency accelerometers through different voltage signal output, acquisition and transmission equipment, so that the integral operation performance is good, and the practicability is good; and a threaded hole is arranged at each corresponding position under the table top, the calibrated accelerometer is installed, the excitation acceleration of each position of the vibration table is different in the vibration process, but the excitation acceleration of the same position is the same, and the simultaneous calibration of multiple accelerometers can be completed. The utility model has the advantages of simple calibration process, short time and capability of calibrating a plurality of sensors simultaneously.

Drawings

FIG. 1 is a schematic diagram of the structure of the apparatus of the present invention.

FIG. 2 is a schematic layout of multiple accelerometer calibrations.

In the figure: 1. a standard intermediate frequency vibration table; 2. a standard intermediate frequency accelerometer; 3. a power amplifier; 4. voltage signal output, acquisition and transmission equipment; 5. a processing and display unit; 6. the accelerometer is calibrated.

Detailed Description

In order to facilitate understanding of the technical solutions of the present invention by those skilled in the art, and to make the technical objects, solutions and advantages of the present invention clearer and clearer, and to fully support the scope of the claims, the following provides further detailed descriptions of the technical solutions of the present invention in the form of specific examples.

As shown in fig. 1, the device mainly includes a standard intermediate frequency vibration table, a calibrated intermediate frequency accelerometer, a power amplifier, a voltage signal output, a collecting and transmitting device, and a processing and displaying unit, and fig. 2 shows a top view and a cross-sectional view of the vibration table, including the standard intermediate frequency accelerometer and the calibrated accelerometer. The standard intermediate frequency vibration table provides a standard intermediate frequency excitation signal and comprises a vibration table top and a rotating base, and a plurality of calibrated accelerometers can be placed on the vibration table top; the vibration direction can be adjusted by rotating the base, and standard excitation signals can be provided for different types of sensors. The standard intermediate frequency accelerometer is used for measuring a standard intermediate frequency excitation signal, and the obtained excitation signal is used for measuring the sensitivity of the calibrated intermediate frequency accelerometer. The calibrated intermediate frequency accelerometer is used as a measured object, and the sensitivity of the calibrated accelerometer is obtained by measuring the standard intermediate frequency accelerometer and the calibrated intermediate frequency accelerometer. The power amplifier is used for amplifying the power of the output voltage signal and exciting the vibration table to generate an excitation amplitude. And the voltage signal output, acquisition and transmission equipment is used for outputting a standard sine signal, and acquiring and transmitting output voltage signals of the standard intermediate frequency accelerometer and the calibrated intermediate frequency accelerometer. And the processing and displaying unit is used for processing and storing the acquired signals of the standard intermediate frequency accelerometer and the calibrated intermediate frequency accelerometer to obtain the sensitivity of the calibrated accelerometer.

The device is used for simultaneously calibrating the sensitivity of a plurality of accelerometers, wherein the accelerometers can be various types of accelerometers.

The working principle is as follows: the voltage signal output, acquisition and transmission equipment 4 outputs a standard sinusoidal signal, the standard sinusoidal signal passes through the power amplifier 3 to excite the standard intermediate frequency vibration table 1, a plurality of standard intermediate frequency accelerometers 2 are arranged below the table top of the standard intermediate frequency vibration table 1, a calibrated accelerometer 6 can be arranged above each standard accelerometer, the voltage signal which is transmitted is acquired through the voltage signal output, acquisition and transmission equipment 4, and the processing and display unit 5 stores and displays the sensitivity calibration result of the calibrated intermediate frequency accelerometer 3.

The voltage signal output, acquisition and transmission equipment 4 is a 0-5V voltage pulse/frequency signal transmitter (C2000MDVA), and corresponding module units are purchased on the internet. The processing and display unit 5 may alternatively be a computer.

The above detailed description is an embodiment of the present invention to facilitate understanding of related art, and is not intended to limit the scope of the present invention. It is clear that the utility model is not restricted to the details of the above-described exemplary embodiments, but that a number of further refinements and improvements, equivalent modifications, etc., can be made on the basis of the utility model by a person skilled in the art. The present examples are, therefore, to be considered as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims.

Claims

1. A multi-accelerometer calibration device, characterized by: the device comprises a standard intermediate frequency vibration table, a standard intermediate frequency accelerometer, a calibrated accelerometer, a power amplifier and voltage signal output, acquisition and transmission equipment;

the standard intermediate frequency vibration table is used for providing a standard intermediate frequency excitation signal and comprises a vibration table top and a rotary base, and the vibration table top is arranged on the rotary base; a plurality of calibrated intermediate frequency accelerometers are arranged below the vibration table top, and standard intermediate frequency accelerometers are arranged on the vibration table top; the rotating base can adjust the vibration direction and provide standard excitation signals for different types of accelerometers; the standard intermediate frequency accelerometer is connected with voltage signal output, acquisition and transmission equipment; the voltage signal output, acquisition and transmission equipment is connected with the rotating base through a power amplifier.

2. A multi-accelerometer calibration device according to claim 1, wherein: and a threaded hole is distributed below the vibration table top, and the calibrated accelerometer is installed in the threaded hole through threads.

3. A multi-accelerometer calibration device according to claim 1, wherein: the voltage signal output, acquisition and transmission equipment is connected with the processing and display unit.

4. A multi-accelerometer calibration device according to claim 1, wherein: the standard intermediate frequency accelerometer is used for measuring a standard intermediate frequency excitation signal, and the obtained excitation signal is used for measuring the sensitivity of the calibrated intermediate frequency accelerometer.

5. A multi-accelerometer calibration device according to claim 1, wherein: the calibrated intermediate frequency accelerometer is used as a measured object, and the sensitivity of the calibrated accelerometer is obtained by measuring the standard intermediate frequency accelerometer and the calibrated intermediate frequency accelerometer.

6. A multi-accelerometer calibration device according to claim 1, wherein: and the voltage signal output, acquisition and transmission equipment is used for outputting a standard sine signal, and acquiring and transmitting output voltage signals of the standard intermediate frequency accelerometer and the calibrated intermediate frequency accelerometer.