Low-Frequency Multi-Output Passive Servo Vibration Sensor for Simultaneous Acceleration and Velocity Measurement

Abstract

The invention provides a low-frequency multi-output passive servo vibration sensor capable of simultaneously measuring acceleration and velocity, which is characterized in that: a base, an upper cover and an upper cover are sequentially connected to form a hollow shell; a permanent magnet is fixed on the base, and the permanent magnet A soft iron is fixed on the top, an armature is fixed around the soft iron, and a coil frame is arranged in the gap between the soft iron and the armature, and the coil frame is connected with the armature by a spring piece; there are three terminal posts on the coil frame; The main coil, auxiliary coil and calibration coil are wound, and the main coil, auxiliary coil and calibration coil are respectively connected to three terminal posts; the front circuit terminal and the rear circuit terminal are arranged on the circuit board, and the front circuit terminal and the rear circuit terminal are connected in parallel There is a capacitor; the first terminal is connected to the front circuit terminal, the rear circuit terminal is connected to signal output one, and the second terminal is connected to signal output two. The invention uses a single sensor and can realize simultaneous measurement of acceleration and speed signals without performing mathematical processing on the signals.

Description

technical field [0001] The invention relates to a measuring instrument, in particular to a vibration measuring sensor. Background technique [0002] Vibration testing is a common test that measures physical quantities such as acceleration, velocity and displacement. At present, most of the vibration sensors are accelerometers, and the test method is mainly based on acceleration measurement. Acceleration is sensitive to medium and high frequency signals. Therefore, vibration tests in the fields of mechanical vibration, impact and collision are mostly acceleration measurements, and acceleration measurement is also the most mature technology. Vibration measurement method. [0003] With the development of science and technology, the problem of low frequency vibration has been paid more and more attention. The following fields are related to low frequency vibration measurement: [0004] 1. Dynamic experiments and structural health monitoring of civil and hydraulic engineering s...

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Problems solved by technology

[0018] 3. According to the published technical information, the frequency of low-frequency geophones can be as low as 1Hz, and many tests need to measure vibration signals below 1Hz, and 1Hz geophones are bulky, heavy, and the elastic components are easily damaged, and the price is also low. Very expensive, it is difficult to meet the needs of engineering low-frequency vibration measurement

[0019] 4. "Passive servo-type reciprocating pendulum multifunctional vibration pickup" can complete the measurement of low-frequency acceleration, velocity and displacement (through one integral of velocity). This type of sensor is widely used in low-frequency vibration measurement, and its disadvantage is that it cannot be simultaneously Complete the measurement of two physical quantities. For example, when measuring acceleration, the speed cannot be measured. If multiple physical quantities need to be measured at the same time, two such vibration pickups need to be installed, which usually means increasing the test cost and complexity of the test;

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