Differential infrared displacement sensing servo acceleration meter
A technology of accelerometer and sensor servo, which is applied in the direction of measuring acceleration, speed/acceleration/shock measurement, measuring devices, etc., can solve the problems affecting the low-frequency characteristics of sensors, high processing accuracy requirements, complex signal processing circuits, etc., and achieve structural Simple, high-sensitivity, wide-ranging effects of dynamic response
Inactive Publication Date: 2011-08-03
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology
Different types of accelerometers have their own advantages and disadvantages. For example, capacitive accelerometers have the advantages of small temperature coefficient, good stability, and high sensitivity, but the disadvantages are that the processing accuracy is too high and the signal processing circuit is complicated; The accelerometer has the characteristics of wide frequency band response and high sensitivity, but the polarization of the piezoelectric material produces a DC charge, which makes it difficult to measure the piezoelectricity at low frequencies, which affects the low-frequency characteristics of the sensor
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[0019] Such as figure 1 As shown, the differential infrared displacement sensing servo accelerometer includes a vibration displacement sensor and a servo feedback control device (working together under the intelligent control of a single-chip microcomputer or DSP),
[0020] The vibration displacement sensor includes a housing 1, a cylindrical proof mass 3, a light blocking sheet 5, an infrared emitting tube 6, an infrared receiving tube 7, and a spring 8;
[0021] The servo feedback control device includes a cylindrical permanent magnet 2, a magnetic drive coil (or coil) 4, a lower permanent magnet support bolt 9, and an upper permanent magnet support bolt 12;
[0022] The casing 1 is made of soft magnetic material (frame structure), and the cylindrical proof mass 3 is set outside the cylindrical permanent magnet 2, and placed together in the casing 1, and the three are kept coaxial (in the casing 1, the cylindrical A magnetic field along the radial direction of the cylinder ...
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The invention relates to a servo acceleration meter based on differential infrared displacement sensing. The differential infrared displacement sensing servo acceleration meter is characterized in that: a shell is made of a soft magnetic material; a cylindrical detection quality block is sleeved outside a cylindrical permanent magnet; the cylindrical detection quality block is fixed on the shell by a spring; a plurality of magnetic driving coils are wound outside the cylindrical detection quality block; two ends of each magnetic driving coil are connected with a feedback current input port which is formed on the shell; a light blocking sheet is fixed on the cylindrical detection quality block; a light transmission hole is formed on the light blocking sheet; two sheet-like infrared receiving tubes are arranged on a supporting plate in parallel from up to down; the supporting plate is fixed on the shell; infrared transmitting tubes are arranged on the shell; the light transmission hole on the light blocking sheet is positioned between the infrared transmitting tubes and the infrared receiving tubes; and output terminals of the infrared receiving tubes are connected with an infrared displacement sensing signal output port through signal lines. The servo acceleration meter based on the differential infrared displacement sensing is characterized by simple structure, good low-frequency property, high measurement accuracy and high sensitivity.
Description
technical field [0001] The invention relates to a servo accelerometer based on differential infrared displacement sensing. Background technique [0002] An accelerometer (also known as an acceleration sensor) is a device used to measure the acceleration of an object's motion, and is widely used in geophysical exploration, seismic survey, transportation, aerospace and other fields. [0003] Acceleration sensors work on the principle of inertia. There are usually two methods of measuring the acceleration of an object's motion: (1) By measuring the displacement or velocity of the object relative to the inertial detection mass, and performing derivative operations on it to obtain the acceleration. (2) Obtain the acceleration of the motion of the object by measuring the magnitude of the inertial force received by the inertial detection mass that moves with the object to be measured. [0004] There are many types of acceleration sensors, from purely mechanical to liquid-floating...
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IPC IPC(8): G01P15/093
Inventor 程永进张光勇马冲景锐平
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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