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Automatic Calibration System for Sound Level Meter Based on PXI Bus Technology

Author: SunQingSheng
Tutor: WangXueJing
School: Beijing University of Chemical Technology
Course: Applied Computer Technology
Keywords: Automatic Verification Sound Level Meter PXI Image Recognition
CLC: TP274
Type: Master's thesis
Year: 2011
Downloads: 32
Quote: 0
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Abstract


The sound level meter to measure the sound pressure level of the instrument, is also one of the acoustics of the basic instrument, are widely used in all walks of life. Protection of sound level meters measure accuracy is of great significance, but the manual test heavy workload, long time, the shortcomings of quality control personnel require high professionalism, can not meet the growing test needs, so the sound level meter automatically test positive significance. On the basis of the principles and methods of the depth of sound level meter test, automatic test system based on PXI sound level meter. The system as the core PXI bus devices, in accordance with the certification process, output standard signal and detects the response of the sound level meter, the final test data generation become the standard format of the report. To obtain the response of the sound level meter, the introduction of image recognition algorithm, this approach has a versatile, simple and reliable test can be achieved on most models sound level meter to avoid response means obtained in previous studies a single, narrow range of applications of the defects. On the hardware side, we use the PXI host instead of the original signal generator with high precision capture card, preamplifier and voltmeter, simplify the number of instruments at the same time, to ensure the accuracy of the signal. The same time, the system will be handed over to the auxiliary equipment PXI host the unified management, reduce human involvement to ensure the realization of the automatic processes. On the software side, the introduction of a modular design principle, the software framework is divided into the underlying public module, three levels of test modules and master modules. Underlying public module contains hardware management, data acquisition and processing, document management, database management and other functions, automatic verification system; verification module is the main body of the system includes the verification process for each test item; master module control each sound level meter's test, which is the core of the verification system. In each level of the software framework, each individual function is packaged as a sub-module and low coupling. Each module with each other to ensure the efficiency and stability of the software system. Accurate identification of the sound level meter, in accordance with the characteristics of the sound level meter verification process, the image recognition process is divided into the process of locating and identifying two. In the positioning process, the row coordinate of the sound level meter readings obtained through the multi-frame difference accumulation algorithm, and analyzed through the communication domain obtain the column coordinates of the sound level meter readings, eventually combining the coordinate positioning result. In the recognition process by the image preprocessing, removing redundant information, and isolated single digit; then compressing the single digital image for 6 × 10 array as the characteristics of the digital; finally using template matching manner to obtain a recognition result. Experiments show that the algorithm has a high recognition rate. The system is able to streamline operations, improve test efficiency, reduce the requirements of quality control personnel. The experimental results show that the test results of the automatic verification system is effective, and has good consistency with the standard device. Can be used for the day-to-day test with sound level meter.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Data processing, data processing system
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