|
|
|
| Free Field Reciprocity Calibration of LS2F Microphone in High Frequency |
| HE LONG-biao1,WANG Bing-xing2,WU Yun3,NIU Feng1,ZHONG Bo1 |
1.National Institute of Metrology,Beijing 100013,China
2.Beijing University of Chemical Technology,Beijing 100029,China
3.Jiangsu Institute of Metrology,Naijing,Jiangsu 210027,China |
|
|
|
|
Abstract To meet the requirements for measurement traceability of air borne ultrasound pressure, PULSE analyzer and reciprocity calibration apparatus are used to found the free-field reciprocity calibration system. High frequency free field sensitivity of LS2F microphones and frequency response from 20 kHz to 51 kHz are obtained with time selective technology. The data with and without time selective technology are compared and the influences of standing wave and reflected wave from wall are analyzed .The result shows that standard deviation is reduced by 1.0 dB with this technology above 40 kHz.
|
|
|
|
|
|
|
|
| ［1］ IEC 61094—1,Measurement microphones Part 1: Specifications for laboratory standard microphones［S］.2000.
［2］IEC 61094-3, Measurement microphones Part 3: Primary method for free-field calibration of laboratory standard microphones by the reciprocity technique ［S］.1995.
［3］汪汉春,邱建华.12. 7 mm标准传声器自由场互易校准装置［J］.计量学报,1997,18(3):182-186.
［4］Wagner R P,Nedzelnitsky V. Determination of acoustic center correction values for type LS2aP microphones at normal incidence［J］.Journal of the Acoustical Society of America,1998,104(1):192-203. |
|
|
|
2012, Vol. 33 
