| 摘要 |
PURPOSE:To simplify the construction, by correcting variations in the resonanse frequency with changes in the density of a power detection vibrator by the resonance frequency of a crystal resonator. CONSTITUTION:A power detection vibrator 10 is so arranged that two beam- shaped plates 11a and 11b are provided parallel in symmetry, formed in a shape of a square with a connection 12 and then, connected to a support 14 through a flexure 13. An exciting element 15a and a vibration detecting element 15b are mounted on the side of the connection 12 and each connected to an amplifier 16 to construct a first exciting means 17. Then, a second exciting means 21 is made up of a crystal resonator 22, an inverter 23, a resistance 24 and a capacitor 25. The outputs of the means 17 and 21 are inputted into a signal processing section 20 with which the rate of change in the resonance frequency with variations in the density of the power detection vibrator 10 is corrected by the resonance frequency of the crystal resonator 22. This can produce a highly accurate power detector at a low cost with a simple construction. |
