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High-precision laser interferometer accelerometer

An accelerometer and laser interference technology, which is used in the measurement of acceleration, velocity/acceleration/shock measurement, measurement devices, etc., can solve the problems of common mode noise and reduce measurement accuracy, and achieve the effect of improving measurement accuracy

Inactive Publication Date: 2019-04-26
SUN YAT SEN UNIV
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Problems solved by technology

[0003] The invention provides a high-precision laser interference accelerometer to solve the problems of the existing phase modulation accelerometers, such as the common mode noise that reduces the measurement accuracy.

Method used

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  • High-precision laser interferometer accelerometer

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Embodiment Construction

[0020] The accompanying drawings are for illustrative purposes only and cannot be construed as limiting the patent;

[0021] In order to better illustrate this embodiment, some parts in the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0022] For those skilled in the art, it is understandable that some well-known structures and descriptions thereof may be omitted in the drawings.

[0023] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Such as figure 1 As shown, a high-precision laser interference accelerometer includes a fixed frame 101, a laser 201, a first interferometric optical path, a second interferometric optical path, a quality block 103, a first high-reflection film 109, a second high-reflection film 110, Magnetic reset device and digital feedback circuit 208;

[0025] One end of the mass block 103 is conn...

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Abstract

The invention discloses a high-precision laser interferometer accelerometer. The high-precision laser interferometer accelerometer comprises a fixed frame, a laser, a first interferometric optical path, second interferometric optical path, a mass block, first high-reflective film, second high high-reflective film, a magnetic suction reset device and a digital feedback circuit; the digital feedbackcircuit calculates the displacement and acceleration of the mass block through a difference form based on the change of phase positions of interference signals in the first interferometric optical path and second interferometric optical path, and then the mass block is reset by controlling the magnetic suction reset device. Because the two sets of the interferometric optical paths are formed andoutput through the difference form for measuring the acceleration, a displacement signal of the mass block is amplified doubly, the influence of common-mode noise such as the environment and laser frequency is suppressed, and the measurement precision of the accelerometer is effectively improved.

Description

technical field [0001] The invention relates to the field of optical acceleration sensors, in particular to a high-precision laser interference accelerometer. Background technique [0002] Accelerometer is an important device for precision measurement and inertial navigation. It is used to measure the acceleration and displacement of moving objects. Compared with conventional accelerometers, accelerometers for optical signal detection have obvious advantages in terms of sensitivity, dynamic range, and reliability. Has been widely used. Among them, optical accelerometers are mainly divided into light intensity modulation type, phase modulation type and wavelength modulation type. At present, the phase modulation type is the most widely used and has high measurement accuracy, but due to the common mode noise in the measurement process, its measurement accuracy is affected. Contents of the invention [0003] The invention provides a high-precision laser interference acceler...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P15/093
CPCG01P15/093
Inventor 李祝黄祥青段会宗骆颖欣涂良成叶贤基覃璇
Owner SUN YAT SEN UNIV
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