GB/T 4130-2017 in English
SUPERSEDEDAcoustics-Low frequency calibration methods of hydrophones
- Issued on:2017-11-01
- Implemented on:2018-05-01
- File Format:PDF
- Delivery:Via email within 5 business days
$476.00
《GB/T 4130-2017声学 水听器低频校准方法》由TC17（全国声学标准化技术委员会）归口，主管部门为中国科学院。
Introduction
Comparison of Core Calibration Methods
| Method | Frequency Range | Uncertainty(dB) | Typical Applications |
|---|---|---|---|
| Hydrostatic Excitation Method | 0.01Hz-1Hz | ≤0.5 | Ultra-low Frequency Ocean Monitoring |
| Piezoelectric Compensation Method | 1Hz-2kHz | ≤0.5 | Laboratory Precision Calibration |
| Coupled Cavity Reciprocity Method | 20Hz-3.15kHz | ≤0.5 | Standard Hydrophone Calibration |
Key Points of Technological Evolution
Compared with the 2000 version, this standard has the following major upgrades:
- The lower frequency limit is extended from 1Hz to 0.01Hz
- Added hydrostatic pressure excitation method (Chapter 4)
- Added vibrating liquid column comparison method (Section 8.3)
- Supplemented term definition chapter (Chapter 3)
Implementation Suggestions
Case: A deep-sea monitoring project used class=instrument>For a hydrophone with a resonant frequency of 0.1Hz, the hydrostatic pressure excitation method is recommended:
- Ensure that the resonant frequency of the calibration system is greater than 1Hz
- Use the dual-frequency point method in Appendix B to determine the equivalent height
- Control the signal-to-noise ratio ≥ 20dB
Measurement uncertainty control
Appendix F analyzes the error sources of the coupled cavity reciprocity method in detail:
- Voltage measurement error contribution 0.025dB
- Cavity volume measurement error contribution 0.022dB
- Acoustic field inhomogeneity contribution 0.153dB
- Combined standard uncertainty 0.25dB (k=1)
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