標準號：IEC 62127-2-2007
中文標準名稱：超音波學.水聽器.第2部分:超音波場小于40MHz的校準
英文標準名稱：Ultrasonics - Hydrophones - Part 2: Calibration for ultrasonic fields up to 40 MHz
標準類型：L31
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：L31
國際標準分類號：17.140.50
引用標準：IEC 60050-801-1994;IEC 60565;IEC 61161-2006;IEC 61828-2006;IEC 62127-1;IEC 62127-3
適用范圍：This part of IEC 62127 specifies:? absolute hydrophone calibration methods;? relative (comparative) hydrophone calibration methods.Recommendations and references to accepted literature are made for the various relative andabsolute calibration methods in the frequency range covered by this standard.This standard is applicable to? hydrophones used for measurements made in water and in the ultrasonic frequency rangeup to 40 MHz;NOTE 1 Although some physiotherapy medical applications of medical ultrasound are developing whichoperate in the frequency range 40 kHz to 100 kHz, the primary frequency range of diagnostic imaging remainsabove 2 MHz. It has recently been established that, even in the latter case, the hydrophone response atsubstantially lower frequencies can influence measurements made of key acoustic parameters [1].? hydrophones employing circular piezoelectric sensor elements, designed to measure thepulsed wave and continuous wave ultrasonic fields generated by ultrasonic equipment;NOTE 2 Some hydrophones can have non-circular active elements, arising from slight deviations from acircular structure caused, for example by electrode structure, or conversely, the active elements can actuallybe squares. The clauses within this standard remain valid, although, in these cases, special attention shouldbe paid to the directional response and to the effective radii of the active element through various axes ofrotation.? hydrophones with or without a hydrophone pre-amplifier.