IEC 62127-2-2007 超音波学.水听器.第2部分:超音波场小于40MHz的校准

标准号：IEC 62127-2-2007
中文标准名称：超音波学.水听器.第2部分:超音波场小于40MHz的校准
英文标准名称：Ultrasonics - Hydrophones - Part 2: Calibration for ultrasonic fields up to 40 MHz
标准类型：L31
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：L31
国际标准分类号：17.140.50
引用标准：IEC 60050-801-1994;IEC 60565;IEC 61161-2006;IEC 61828-2006;IEC 62127-1;IEC 62127-3
适用范围：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.