公开(公告)号：US4470313A

公开(公告)日：1984-09-11

申请号：US365678

申请日：1982-04-05

申请人： Richard W. Kalinoski ,  George E. Sgourakes ,  Duane Thompson

发明人： Richard W. Kalinoski ,  George E. Sgourakes ,  Duane Thompson

IPC分类号： G01L1/10 ,  G01L1/16 ,  G01L9/00 ,  G01P15/10

CPC分类号： G01L9/0014 ,  G01L1/103 ,  G01L1/167 ,  G01P15/10 ,  Y10S73/01

摘要： A resonant wire instrument for producing a measurement signal, which is derived from the resonant frequency of a vibratable wire tensioned in accordance with the magnitude of a physical variable being measured, wherein a force impulse produced mechanically by an apparatus is applied to displace laterally one end of the vibratable wire so as to excite the wire into resonant motion. In one embodiment, the one end is rigidly attached to a housing and a piston applies a transverse force impulse to that end by momentarily striking the housing. In another embodiment, the one end is connected to a piezoelectric crystal which responds to a short-duration electric field to displace momentarily that end. In one species of this other embodiment, the crystal is made to oscillate at the resonant frequency of the tensioned wire by the application of an alternating-polarity voltage signal that is generated by a voltage source having an output connected to the crystal, and a feedback circuit coupled to receive the measurement signal operates to produce a control signal that is used for controlling the voltage source so that the voltage signal being applied to the crystal has a frequency which varies in accordance with changes in the resonant frequency of the wire.

摘要翻译： 一种用于产生测量信号的共振线路仪器，其根据被测量的物理变量的幅度拉伸的可振动线材的共振频率导出，其中施加由设备机械地产生的力脉冲以横向移位一端 的振动线，以便将线激发成共振运动。 在一个实施例中，一端刚性地附接到壳体，活塞通过瞬间撞击壳体向该端施加横向力冲击。 在另一个实施例中，一端连接到压电晶体，该压电晶体响应于短持续时间的电场以瞬时移动该端。 在该另一实施例的一个种类中，通过施加由具有连接到晶体的输出的电压源产生的交流极性电压信号，使晶体以张紧线的谐振频率振荡，并且反馈 耦合以接收测量信号的电路操作以产生用于控制电压源的控制信号，使得施加到晶体的电压信号具有根据线的谐振频率的变化而变化的频率。