This paper presents the development and implementation of a new servo-type vibration sensor which can measure both absolute velocity and displacement signals simultaneously under the low range of frequency. In general, measuring frequency range of a seismo-type sensor is higher than its natural frequency. For the purpose of increasing the measuring frequency range of the sensor, it is necessary to decrease the natural frequency of the sensor. In this paper, sensor with low natural frequency is realized by a positive feedback method. As a result, a sensor with a light mass and hard springs is obtained. This sensor is shown to be effective in controlling the vibration of a flexible structure.
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