Novel range-adjustable magnetic liquid acceleration sensor

An acceleration sensor and magnetic liquid technology, applied in the field of inertial sensors, can solve the problems of reduced sensor accuracy, smaller restoring force, and short range, and achieve the effects of avoiding accuracy reduction, long life, and adjustable range.
CN103675342AInactive Publication Date: 2014-03-26BEIJING JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING JIAOTONG UNIV
Publication Date
2014-03-26
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a novel range-adjustable magnetic liquid acceleration sensor, and belongs to the technical field of inertial sensors. Current magnetic liquid acceleration sensors are short in range and large in size, and also have the problem that for long-term use, the accuracy of sensor is reduced due to that restoring forces are reduced because of demagnetization of permanent magnets. The sensor is composed of an air tank, an air duct, a valve, a pressure gauge, an end cap, a shell, an inductive coil, a cylindrical permanent magnet, a rubber seal ring, a bolt / nut connecting assembly, air, magnetic liquid and a signal circuit, wherein the cylindrical permanent magnet and the magnetic liquid form inertial mass. While enabling the permanent magnet to float in the inner cavity of the shell, the magnetic liquid also can seal the air in the cavities at two ends in the inner cavity of the shell. When moving axially, the inertial mass compresses the air in the cavity at one end to generate the restoring force. The range of the sensor can be adjusted by changing the restoring force through adjusting air pressure in the cavities at two ends in the inner cavity of the shell. The sensor has adjustable range, small size and long service life.
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Description

technical field

[0001] The invention relates to the technical field of inertial sensors, in particular, the invention relates to a novel magnetic liquid acceleration sensor with adjustable range. Background technique

[0002] The magnetic liquid is a new type of functional material formed by uniformly dispersing nano-scale magnetic solid particles into the carrier liquid. The magnetic liquid acceleration sensor is developed by using the characteristic that the magnetic liquid can suspend the permanent magnet or non-magnetic material with a density higher than itself. Compared with traditional acceleration sensors, magnetic liquid acceleration sensors have the advantages of high sensitivity, impact resistance, low energy consumption, and good low-frequency response. The existing structure of the magnetic liquid acceleration sensor, such as the patent US2007 / 0214889A1, has a short range and a large volume. After long-term use, there is still the problem that the demagnetizati...

Claims

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