Hydrophone calibration system - Digilogic Systems

1. Hydrophone Calibration Systems A Hydrophone calibration system is a very important tool which is used to achieve precision and certainty of measurements in underwater acoustics. Hydrophones are referred to as sensors that are responsible for the detection and recording of underwater sound waves, and accordingly the method is applied in many fields including, but not limited to, oceanography, marine biology, environmental monitoring, and defence applications. In order to realize the exactness of their devises by a good calibration system it's just a must. Page 1 of 6

2. Key Components of the Hydrophone Calibration System: Reference Source: The stabilization and known acoustic characteristic are the reasons for which the source became a reference standard. This can for example involve a speaker system that has been carefully calibrated towards the underwater sound or a sound generator that is controlled. The source material should equip user with a frequency range which is equivalent to the hydrophones purpose. Calibration Chamber: The calibration chamber meets all necessary specifications for hydrophone calibration as it offers a controlled environment. An additional layer of protection is to instigate a stiff sound proof wall and then fill it with a sound absorbing material that is as close as possible to properties of pure water. So sensor calibration experiments are designed to meet the rising demand for more realistic scenarios. Signal Conditioning and Amplification: Using best signal quality conditioning and amplification equipment is essential to provide more accurate measurement of hydrophone signals received. This system involves receiving, pre-amplification and filtering of low noise to remove unnecessary noise and interferences. Page 2 of 6

3. Data Acquisition System: The intelligent data analytics system must be provided to do the job of reading the hydrophone into the calibration acoustic signals. Our proposed system can be designed as a high sampling rate device that allows for transmission over a wide range of frequencies. Types of Tests included: Reciprocity Test Comparison Test Transmitting Voltage Response Test up to 64 channels Free Field Receiving Sensitivity Test up to 64 channels Directivity Test for multiple frequencies Directivity Test with External Trigger Directivity Test with External Trigger for multiple frequencies Insulation Resistance Measurement Modularity & Scalability of PXIe platform Calibration Procedure: Baseline Measurement: Start your test without signal and measure the hydrophone measurement with no additional signal present. This gives the option to calibrate during subsequent noise measurements with corresponding background noise. Page 3 of 6

4. Frequency Sweep: Sweep done with use of reference source onto the full range span of interest, from the lowest to the highest frequency. Sound hydrophones at different frequencies. These data correlations provide the calibration curves. Amplitude Calibration: Set calibration of the hydrophone's amplifier by reading the response against known acoustic levels. Models should boast of the precise mathematical apparatus to transform and treat the results of amplifier measurements for practical applications. Environmental Corrections: Compensate for the environmental nuances that may arise from the working environment conditions like temperature, pressure, and salinity which may also affect the hydrophone's performance. Accomplish considering correction factors that can be used to correct the other variable. Documentation: Keep books of the calibration documentation which comprise the calibration curves, correction factors, and any changes done. That traceability and quality assurance of the including documentation are extremely important. Page 4 of 6

5. Conclusion: Ensuring the high precision and dependability of underwater acoustic measurement data implies the use of an efficient acoustic calibration of hydrophones. Through adhering to diligent calibration procedures and using cutting-edge methodology, researchers and professionals can make certain that the hydrophones they install gives the exact data in underwater environments of different types. Providing an acoustic environment for science is especially important for developing the marine sciences, as well as environmental monitoring and defence applications that entirely depend on the accurate measurements. Page 5 of 6

6. Contact us today to discuss your specific Hydrophone Calibration System requirements https://www.digilogicsystems.com/ Phone: Hyderabad: (+91) 40 4547 4601 / 02 / 03 Bangalore: (+91) 80 4975 6034 Email: info@digilogicsystems.com Location #102, 1st Floor, DSL Abacus Tech Park Beside DSL Virtue Mall, Uppal, Hyderabad, Telangana-500 039, India #216, 3rd floor, Zareen Heights, Varthur Road, Nagavarapalya, C. V. Raman Nagar, Bengaluru, Karnataka – 560093. Page 6 of 6