公开(公告)号：US4363242A

公开(公告)日：1982-12-14

申请号：US199767

申请日：1980-10-23

申请人： Joseph S. Heyman

发明人： Joseph S. Heyman

IPC分类号： G01H13/00 ,  G01N29/07 ,  F16B13/02 ,  G01H1/00 ,  G01N29/00

CPC分类号： G01N29/075 ,  G01H13/00 ,  G01N2291/02827 ,  G01N2291/02872

摘要： The RF output of a voltage controlled oscillator (VCO) 11 is periodically gated by gate 15 to a transducer 18 which produces acoustic waves in bolt 19. The reflected acoustic waves are converted to electrical signals by transducer 18 and gated by a gate 20 to mixer 31. Mixer 31 also receives the output from VCO 11 and produces an output which is filtered by low pass filter 32. The output of filter 32 is a DC signal proportional to the phase difference change from a fixed phase difference between the two input signals to mixer 32. This DC signal is sampled at an instant and held by circuit 33 in response to the "P" signal. The output of circuit 33 is integrated by integrator 34 and then applied to VCO 11 to change the frequency of VCO 11 such that the phase difference between the two inputs to mixer 31 remains at said fixed phase difference. The frequency of VCO 11 is a measure of the change in strain of bolt 19.

摘要翻译： 压控振荡器（VCO）11的RF输出由门15周期性地选择到产生螺栓19中的声波的换能器18.反射的声波由换能器18转换成电信号，并由门20门控到混频器 混频器31还接收来自VCO 11的输出并产生由低通滤波器32滤波的输出。滤波器32的输出是与从两个输入信号之间的固定相位差到相位差变化成比例的直流信号， 该DC信号在瞬间被采样，并由电路33响应于“P”信号而被保持。 电路33的输出由积分器34集成，然后施加到VCO 11以改变VCO 11的频率，使得到混频器31的两个输入之间的相位差保持在所述固定相位差。 VCO11的频率是螺栓19的应变变化的量度。

公开(公告)号：US4062227A

公开(公告)日：1977-12-13

申请号：US754066

申请日：1976-12-23

申请人： Joseph S. Heyman

发明人： Joseph S. Heyman

IPC分类号： G01B17/04 ,  G01H13/00 ,  G01L1/25 ,  G01N29/12 ,  G01N29/22 ,  G01N29/36 ,  G01N29/00

CPC分类号： G01B17/04 ,  G01H13/00 ,  G01L1/255 ,  G01N29/12 ,  G01N29/227 ,  G01N29/36 ,  G01N2291/014 ,  G01N2291/02827 ,  G01N2291/2691

摘要： This invention is a CW ultrasonic device for measuring frequency shifts of the peak of a mechanical resonance in a body. One application of the device is measuring the strain in a bolt. It also has other applications such, for example, as measuring the thickness of a body, measuring the depth of a flaw in a body, measuring the elongation of body and measuring changes in velocity of sound in a body. The body is connected, by means of a CW transducer, to electrical circuit means including a narrow band RF amplifier to form a closed loop feedback marginal oscillator that frequency locks the device to the peak of a mechanical resonance in the body. Thereafter, when the frequency of this peak changes, because of a physical change in the body, the frequency of the oscillator changes. The device includes an automatic frequency resonant peak tracker that produces a voltage that is related to a change in frequency of the oscillator. This voltage is applied to the RF amplifier to change the center of its frequency band to include the frequency of the peak and is a measure of the frequency shift. The device also includes a special transducer which requires contact to only one side of the body and provides high electrical isolation between its parts.

摘要翻译： 本发明是用于测量身体机械共振峰值的频移的CW超声波装置。 该装置的一个应用是测量螺栓中的应变。 它还具有其他应用，例如测量身体的厚度，测量身体中的缺陷的深度，测量身体的伸长并测量身体中的声音的变化。 身体通过CW传感器连接到包括窄带RF放大器的电路装置，以形成闭环反馈边缘振荡器，其将装置频率锁定到身体机械共振的峰值。 此后，当该峰值的频率变化时，由于身体的物理变化，振荡器的频率发生变化。 该装置包括产生与振荡器的频率变化相关的电压的自动频率谐振峰值跟踪器。 该电压被施加到RF放大器以改变其频带的中心以包括峰值的频率，并且是频移的量度。 该装置还包括特殊的换能器，其需要仅接触身体的一侧并且在其部件之间提供高电隔离。