| 摘要 |
PURPOSE:To improve detection precision by providing a weight attached by a support member and a circuit which calculates the difference in output frequency between two oscillation circuits which oscillate two piezoelectric vibrators, and measuring acceleration from the output of the circuit. CONSTITUTION:When an acceleration sensor moves with acceleration alpha as shown by an arrow A, the tensile strength applied to a left-side crystal resonator 3 becomes F0-malpha, and the tensile strength applied to a right-side crystal resonator 4 becomes F0+malpha. Consequently, the tensile force applied to the crystal resonator 3 decreases, so the output frequency of the crystal oscillation circuit 10a increases up to f3=f0+DELTAf. Further, the tensile strength applied to the crystal resonator 4 increases, so the output frequency of the crystal oscillation circuit 10b decreases to f4=f0-DELTAf. Consequently, the acceleration alpha is calculated through a mixer 10c from two-fold output frequency variation. Thus, a high-precision measurement of the acceleration is taken. |
