Measurement of the electrical and mechanical responses of a force transducer against impact forces

Abstract

A method for measuring the electrical and mechanical responses of force transducers to impact loads is proposed. The levitation mass method (LMM) is used to generate and measure the reference impact force used. In the LMM, a mass that is levitated using an aerostatic linear bearing (and hence encounters negligible friction) is made to collide with the force transducer under test, and the force acting on the mass is measured using an optical interferometer. The electrical response is evaluated by comparing the output signal of the force transducer with the inertial force of the mass as measured using the optical interferometer. Simultaneously, the mechanical response is evaluated by comparing the displacement of the sensing point of the transducer, which is measured using another optical interferometer, with the inertial force of the mass. To demonstrate the efficiency of the proposed method, the impact responses of a force transducer are accurately determined.

Toward dynamic force calibration

“…As for (3), the electrical and mechanical responses of a force transducer against impact forces are measured using 2 axes optical interferometer based on the LMM [21]. This technique will be effective to evaluate the response of the transducer against its acceleration.…”

Materials Testers Using Micro-Newton Level Forces Based on the Levitation Mass Method (LMM)

“…The first author has modified it as calibration methods for three typical categories of the dynamic force calibration [1,2,3], that are the dynamic calibration method under impact load [1], the dynamic calibration method under oscillation load [2] and the dynamic calibration method under step load [3]. Recently, a method for evaluating the electrical and mechanical responses of a force transducer against impact forces has been proposed by the first author [4]. Besides the LMM, there are some studies on the dynamic force calibration [5][6][7][8][9].…”

Evaluation of the dynamic properties of a Voice Coil Motor (VCM)

“…The author has proposed a method, the "Levitation Mass Method" (LMM) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. In this method, the inertial force of a mass levitated using a pneumatic linear bearing is used as the reference force applied to the objects being tested, such as force transducers, materials and structures.…”