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propane
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United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Acoustics, Ultrasound, Vibration for United Kingdom (.PDF file)
Free-field sensitivity level. Reference measuring hydrophones/ projectors. Measurand unit, V/µPa
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.7
Three-transducer spherical wave reciprocity in a laboratory tank, IEC 565:1977
Frequency: 1 kHz to 2 kHz
Approved on 29 September 2004
Internal NMI service identifier: NPL/AW/10/01
 
Free-field sensitivity level. Reference measuring hydrophones/ projectors. Measurand unit, V/µPa
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.5
Three-transducer spherical wave reciprocity in a laboratory tank; IEC 565:1977
Frequency: 2 kHz to 500 kHz
Approved on 29 September 2004
Internal NMI service identifier: NPL/AW/10/01
 
Free-field sensitivity level. Reference measuring hydrophones. Measurand unit, V/µPa
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.9
Comparison with reference hydrophone, IEC 565:1977
Frequency: 1 kHz to 2 kHz
Approved on 29 September 2004
Internal NMI service identifier: NPL/AW/10/02
 
Free-field sensitivity level. Reference measuring hydrophones. Measurand unit, V/µPa
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.7
Comparison with reference hydrophone, IEC 565:1977
Frequency: 2 kHz to 1 MHz
Approved on 29 September 2004
Internal NMI service identifier: NPL/AW/10/02
 
Pressure sensitivity level. Reference measuring hydrophones. Measurand unit, V/µPa
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.5
Comparison with a calibrated reference microphone
Frequency: 25 Hz to 400 Hz
Approved on 29 September 2004
Internal NMI service identifier: NPL/AW/10/03
 
Free-field sensitivity. Hydrophone. Measurand unit, µV/Pa
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 6
Comparison with a secondary hydrophone in a non-linearly distorted sound field
Frequency: 1 MHz to 8 MHz
Approved on 29 September 2004
Internal NMI service identifier: NPL/AW/07/01
 
Free-field sensitivity. Hydrophone. Measurand unit, µV/Pa
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 7
Comparison with a secondary hydrophone in a non-linearly distorted sound field
Frequency: 9 MHz to 12 MHz
Approved on 29 September 2004
Internal NMI service identifier: NPL/AW/07/01
 
Free-field sensitivity. Hydrophone. Measurand unit, µV/Pa
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 8
Comparison with a secondary hydrophone in a non-linearly distorted sound field
Frequency: 13 MHz to 16 MHz
Approved on 29 September 2004
Internal NMI service identifier: NPL/AW/07/01
 
Free-field sensitivity. Hydrophone. Measurand unit, µV/Pa
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 11
Comparison with a secondary hydrophone in a non-linearly distorted sound field
Frequency: 17 MHz to 20 MHz
Approved on 29 September 2004
Internal NMI service identifier: NPL/AW/07/01