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1、August 2008 IEC 62127-2 (First edition 2007) Ultrasonics Hydrophones Part 2: Calibration for ultrasonic fields up to 40 MHz C O R R I G E N D U M 1 Page 15 5 Overview of calibration procedures 5.1 Principles On page 16, instead of: NOTE 2 “Absolute” hydrophone calibration is understood here in the s
2、ense of “without reference to another hydrophone”. This is sometimes also referred to as “primary” or “substitution” procedure, which means a sensitivity comparison with a calibrated reference hydrophone. The reference hydrophone itself may have been calibrated in “absolute” terms or against another
3、 reference hydrophone, and so on. Obviously, there are two different, fundamental procedures: to perform an absolute hydrophone calibration and to compare the sensitivity of two hydrophones. Clauses 9, 10, 11, Annexes D, F and H deal with the former procedure. The latter procedure is dealt with in d
4、etail in Clause 12. It should be noted that a substitution calibration usually involves both steps and that the interested user should refer to both Clause 12 and other clauses dealing with absolute calibration (and that uncertainties from both fundamental steps contribute to the final calibration u
5、ncertainty in the case of a substitution calibration). read: NOTE 2 “Absolute” hydrophone calibration is understood here in the sense of “without reference to another hydrophone”. This is sometimes also referred to as “primary” calibration. On the other hand, hydrophones are often calibrated in prac
6、tice following a “secondary” or “substitution” procedure, which means a sensitivity comparison with a calibrated reference hydrophone. The reference hydrophone itself may have been calibrated in “absolute” terms or against another reference hydrophone, and so on. Obviously, there are two different f
7、undamental procedures: to perform an absolute hydrophone calibration and to compare the sensitivity of two hydrophones. Clauses 9, 10, 11, and Annexes D, F and H deal with the former procedure. The latter procedure is dealt with in detail in Clause 12. It should be noted that a substitution calibrat
8、ion usually involves both steps and that the interested user should refer to both Clause 12 and the other clauses dealing with absolute calibration (and that uncertainties from both fundamental steps contribute to the final calibration uncertainty in the case of a substitution calibration). Page 20
9、6.3 Hydrophone size In the second sentence, instead of: “.the effective radius of the hydrophone small be small compared with.” read: “the effective radius of the hydrophone shall be small compared with.” Copyright International Electrotechnical Commission Provided by IHS under license with IECLicen
10、see=Boeing Co/5910770001 Not for Resale, 10/25/2008 03:15:36 MDTNo reproduction or networking permitted without license from IHS -,-,- August 2008 Page 25 10 Free field calibration by planar scanning On page 26, for Equation (6), instead of: =dzdytlyxIlPcos),()( (6) read: =dxdytlyxIlPcos),()( (6) Pa
11、ge 38 Annex D Absolute calibration of hydrophones using the planar scanning technique D.2 Hydrophone scanning methodology For Equation (D.2), instead of: = + N i R Rr i i s r slUrrrlU N dxdytlyxU 1 2 2 L 2 L 2 L 2 1 2 ),(),()(),( (D.2) read: = + N i R Rr i i s 2 r slUrrrlU N dxdytlyxU 1 2 2 L 2 L 2
12、L 2 1 ),(),()(),( (D.2) Page 39 D.3 Corrections and sources of measurement uncertainty D.3.4 Directional response In the last sentence of the first paragraph, instead of: 1= tan-1(x2 + y2)/l read: 1= arctan (x2 + y2)/l Page 41 D.3.6 Noise In the first paragraph, fourth sentence, instead of : “The rm
13、s noise level, Un(l,x,y)“ read: “The rms noise level, Un(x,y,l)“ Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=Boeing Co/5910770001 Not for Resale, 10/25/2008 03:15:36 MDTNo reproduction or networking permitted without license from IHS -,-,- Augus
14、t 2008 D.3.7 Non-linear propagation For Equation (D.10), instead of: R = l/ at2 (D.10) read: R = l/ at2 (D.10) Page 43 D.4 Rationale behind the planar scanning technique for calibrating hydrophones D.4.2 Relationship between hydrophone and transducer effective radii For equation (D.14), instead of:
15、k ah sin() (D.14) read: k ah sin() 1 (D.14) Page 48 Annex F The absolute calibration of hydrophones by optical interferometry up to 40 MHz F.2.3.1.1 Measurement system On page 50, for Equation (F.2), instead of: )( )0( 2 lS fV fV UT U= = (F.2) read: )( )0( 2 lS fV fV UTF U= = (F.2) and, directly fol
16、lowing Equation (F.2), instead of: l is the optical wavelength (the wavelength of the light in vacuum;) read: l is the optical wavelength (the wavelength of the light in vacuum;) Page 56 F.2.3.2.4 Calibration corrections and sources of measurement uncertainty Renumber subclause F.2.3.2.5 as F.2.3.2.
17、4.1 and subclause F.2.3.2.6 as F.2.3.2.5. Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=Boeing Co/5910770001 Not for Resale, 10/25/2008 03:15:36 MDTNo reproduction or networking permitted without license from IHS -,-,- August 2008 Page 58 Annex G
18、Waveform concepts G.4 Hydrophone position concepts G.4.3 Far field hydrophone position with special reference to a long propagation path in order to achieve non-linear distortion (concept C) On page 62, in the fourth sentence of the second paragraph, instead of: “.50 % of the pressure amplitudeat th
19、e source.” read: “.50 % of the pressure amplitude at the source.” and instead of: “.the harmonic number corresponding to the upper frequency band of the hydrophone.” read: “.the harmonic number corresponding to the upper frequency limit of the hydrophone.” Page 63 G.5 Special considerations for cali
20、brations close to the face of a transducer G.5.2 Influence of edge waves In the first sentence of the note, on page 64, instead of: “.the inequality as outlined in equation (G.6).” read: “.the inequality as outlined in equation (G.5).” Page 68 Annex H Time delay spectrometry requirements and a brief
21、 review of the technique H.3 Measurement procedure (sensitivity intercomparison) Correct “b” to “b)” in the lettering of the second item. Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=Boeing Co/5910770001 Not for Resale, 10/25/2008 03:15:36 MDTNo reproduction or networking permitted without license from IHS -,-,-