JJG 1182-2021Verification Regulation of Vector Hydrophones in the Frequency Range 20 Hz to 1 kHz (English PDF)

1 Scope(1)

2 References(1)

3 Terms and units of measurement(1)

3.1 Particle acceleration sensitivity (1)

3.2 Particle acceleration sensitivity level (1)

3.3 Particle velocity sensitivity (1)

3.4 Sensitivity level of particle velocity (2)

3.5 Particle displacement sensitivity (2)

3.6 Particle displacement sensitivity level(2)

3.7 Frequency Response of Sensitivity Level(2)

3.8 Axial Sensitivity Asymmetry(2)

3.9 Transverse rejection ratio(2)

4 Overview(2)

5 Metrological performance requirements (2)

5.1 Sensitivity levels(2)

5.2 Frequency Response of Sensitivity Level(3)

5.3 Directivity(3)

6 General technical requirements (3)

6.1 Appearance(3)

6.2 Marking and factory information (3)

6.3 Functionality(3)

7 Measuring Instrument Control(3)

7.1 Test conditions (3)

7.2 Verification items and verification methods (4)

7.3 Processing of verification results (8)

7.4 Verification cycle (8) Appendix A Format of the Inner Pages of the Verification Certificate and Verification Result Notification (9) A:1 Format of the inner page of the verification certificate (9) A:2 Format of the inner page of the test result notification (12) Appendix B Standing Wave Tube Design Requirements (13)

Introduction

This regulation is prepared according to the rules given in JJF1002-2010 "Rules for Compilation of National Metrology Verification Regulations", and According to the requirements of JJF1059.1-2012 "Assessment and Expression of Measurement Uncertainty", the measurement uncertainty is evaluated and expressed:

This regulation uses the standing wave tube absolute calibration method, which is consistent with JJF1340-2012 "20Hz~2000Hz vector it is different from Hydrophone Calibration Specification, which uses the standing wave tube comparison method:

This regulation is published for the first time:

Verification Regulations for 20Hz~1kHz Vector Hydrophone

1 Scope

This regulation applies to the initial verification and follow-up verification of vector hydrophones used in the frequency range of 20Hz~1kHz and check in use:

For the type of vector hydrophone that includes a sound pressure channel, this regulation is only applicable to the verification of its vector channel:

2 References

This procedure references the following documents:

JJG 233-2008 piezoelectric accelerometer JJG 449-2014 Octave and Fractional Octave Filters JJF1001 General Metrology Terms and Definitions JJF1034-2020 Acoustic Metrology Terms and Definitions JJF1340-2012 20Hz~2000Hz vector hydrophone calibration specification GB/T 3102.7 Acoustic quantities and units Commonly used frequencies in GB/T 3240-1982 acoustic measurement GB/T 3947 Acoustic Terminology for dated references, only the dated version applies to this regulation; for undated references document, its latest version (including all amendments) applies to this regulation:

3 Terminology and units of measurement JJF1001, JJF1034, GB/T 3947 and JJF1340-2012 and the following terms and definitions apply in this regulation:

This regulation adopts the quantities and units specified in GB/T 3102.7:

The ratio of the open circuit voltage at the output of a vector hydrophone to the actual particle acceleration acting on its receiving surface:

Unit: V/(m s-2):

The base 10 logarithm of the ratio of the magnitude of the particle acceleration sensitivity to the reference value multiplied by 20:

Unit: dB:

Note: The reference value is 1V/(m·s-2):

The ratio of the open circuit voltage at the output of a vector hydrophone to the actual particle velocity acting on its receiving surface: