Seismic transducers calibration system

Calibration of the seismic sensors should be conducted in the low-frequency domain, which means, that the relative method used for calibration of the vibration transducers is not applicable since it does not guarantee the required accuracy level. The problem is that the reference accelerometers have uneven AFR characteristic in the low-frequency domain. Thus, calibration of seismic transducers requires implementation of a different approach.

The use of displacement transducer allows to solve the issue of accurate reproduction of vibration in the low-frequency domain. Besides, it enables control of the relevant parameters in the course of tests performance.

Spheres of application

Calibration of the seismic transducers
Calibration of the seismic recorders
Velocimeters calibration
Calibration of the displacement transducers

Operating principles

Calibration system of the vibration transducers

The seismic transducer to be calibrated is mounted on the shaker system.

The displacement transducer is installed in such a way so that the laser beam would be transverse to the measuring axis of the transducer under calibration.

The transducers are connected to the input channels of the FFT Spectrum analyzer. The signal from the generator (i.e., the output of the FFT Spectrum analyzer) is sent to the power amplifier and the coil of the shaker system. The generator is used for the control of frequency domain and maintenance of the set vibration level depending on the values received from the displacement transducer.

The principle of measurements performance s as follows: the displacement transducer is used for control of the vibration parameters produced by the shaker system (i.e., displacement and frequency).

Based on this data, the system calculates the vibration velocity and vibration acceleration in real-time mode and adjust the voltage level applied to the shaker system, thus securing conformance of the parameters with the test profile used.

As the system reaches steady operation, it begins the analysis of signal produced by the seismic transducer under calibration and calculates the transmission ratio for the set frequency range. The measurements are conducted in each point of the 1/3 octave spectrum throughout the entire frequency range of the transducer under calibration, which allows to evaluate the AFR characteristic parameters.

In the interface of the program, the user has to set the frequency range and the amplitude of the vibration displacement to be used in the calibration process. Based on the readings of the displacement transducer, the system determines the required vibration level, which is then divided by the voltage value at the output of the seismic transducer. Thus, there is obtained the conversion ratio of the transducer for each particular frequency. Upon completion of the test procedure, there is produced a Test Protocol.

It is possible to edit the Test Protocol template.

SCADA - project for calibration of the seismic transducers

Components of the system

BASIC CONFIGURATION
Item Designation Quantity
Shaker system reproduction of vibration impact 1
Power amplifier BAA500-T  amplification of the signal applied to the shaker 1
Reference displacement transducer reference transducer for calibration of the transducers 1
FFT Spectrum analyzer ZET-017  recording and control of the signals from the primary transducers; control of the shaker system 1
Software “Calibration of the seismic transducers” SCADA-project for evaluation of the calibrated transducers parameters 1
PC or laptop on request 1

POR (price on request)

Note

If you need to conduct other types of tests with the use of the shaker system, we recommend you to buy the “VCS” configuration of the FFT Spectrum analyzer. This configuration of the vibration control system includes the programs “Broad-band random vibration”, “Classical shock”, “Vibration shock”, etc.

Request price for the seismic transducers calibration system

Parameters of the shaker system

Parameters of the displacement transducers

Contact information

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