The investigation of a μGal-level cold atom gravimeter for field applications

被引：78

作者：

Wu, Bin ^{[1
]}

Wang, Zhaoying ^{[1
]}

Cheng, Bing ^{[1
]}

Wang, Qiyu ^{[1
]}

Xu, Aopeng ^{[1
]}

Lin, Qiang ^{[1
]}

机构：

[1] Zhejiang Univ, Inst Opt, Dept Phys, Hangzhou 310027, Zhejiang, Peoples R China

来源：

METROLOGIA | 2014年 / 51卷 / 05期

基金：

中国国家自然科学基金;

关键词：

atomic gravimeter; the quadratic Zeeman effect; atom interferometer; INTERFEROMETRY; SENSITIVITY; CONSTANT;

D O I：

10.1088/0026-1394/51/5/452

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Typical atomic gravimeters have a heavy magnetic shielding to avoid the quadratic Zeeman effect, and also a complicated active vibration isolation system to suppress the vibration noise. Both of them make it difficult to build a mobile and compact gravimeter. In this paper, we present the implementation of an atomic gravimeter aiming at field applications. Our gravimeter uses improved magnetic coils instead of the expensive mu-metal for magnetic shielding. The quadratic Zeeman shift is evaluated with high accuracy. Moreover, a portable platform of relatively small size is applied for vibration isolation. The total interrogation time is optimized to 120 ms and the repetition rate is 2.2 Hz. A sensitivity of 1.0 x 10(-7) g Hz(-1/2) and a resolution of 5.7 x 10(-9) g within 1000 s integration time are reached. A continuous g measurement over 128 h is carried out. Moreover, a whole seismic wave of about 1 h that occurred in Pakistan on 28 September 2013 is recorded by our atomic gravimeter. The results coincide with that recorded by a traditional seismic detector very well.

引用

页码：452 / 458

页数：7