公开(公告)号：US4485323A

公开(公告)日：1984-11-27

申请号：US575190

申请日：1984-01-30

Applicant: James P. Corbett

Inventor： James P. Corbett

IPC: G01L1/16 ,  G01L9/00 ,  H01L41/08

CPC classification number: G01L1/162 ,  G01L9/0022

Abstract: A force and pressure transducer comprises a plate-like crystal. Two separate portions of the crystal are maintained in oscillation at separate frequencies by a circuit. The force to be measured, is applied by a seating to a part of the crystal edge such that compression in one of the oscillating portions causes the frequency of that oscillating portion to change substantially whereas the frequency of the other portion changes only minimally.In the past it has been difficult to manufacture crystals in which the frequency versus temperature response of each of the two oscillating portions was sufficiently well matched to permit the difference frequency between the portions to be used as the instrument output signal.This invention resides in the application of a second fixed force by a spring via a seating to a second part of the crystal edge in such a way as to influence the frequency of oscillation of this second portion. In so doing the second seating can be adjusted to cause the frequency change due to temperature of the second oscillating portion to become as nearly as possible matched to the frequency versus temperature response of the first oscillating portion of the crystal thus providing a frequency change derived by computing the difference frequency between the two portions. This difference frequency forms the instrument output and responds only to the force applied to the instrument and not to the ambient temperature of the instrument.

Abstract translation: 力和压力传感器包括板状晶体。 晶体的两个分开的部分通过电路保持在分开的频率的振荡。 要测量的力通过座位施加到晶体边缘的一部分，使得在其中一个振荡部分中的压缩导致该振荡部分的频率基本上改变，而另一部分的频率仅最小化地改变。 在过去，制造晶体是困难的，其中两个振荡部分中的每一个的频率对温度响应足够好地匹配，以允许要用作仪器输出信号的部分之间的差频。 本发明在于通过弹簧将第二固定力施加到晶体边缘的第二部分，以影响该第二部分的振荡频率。 在这样做时，可以调整第二座位以使得由于第二振荡部分的温度引起的频率变化变得尽可能接近晶体的第一振荡部分的频率对温度响应，从而提供由 计算两个部分之间的差分频率。 该差异频率形成仪器输出，仅响应于施加到仪器的力而不响应仪器的环境温度。

公开(公告)号：US5424598A

公开(公告)日：1995-06-13

申请号：US192458

申请日：1994-01-18

Applicant: James P. Corbett

Inventor： James P. Corbett

IPC: G01L1/16 ,  G01L9/00 ,  H01L41/08

CPC classification number: G01L9/0022 ,  G01L1/162

Abstract: A force or fluid pressure transducer comprises a plate-like crystal. The force, to be measured, is applied by two seatings disposed on opposite edges of the crystal. The transducer can measure pressure when a diaphragm is added to provide the force.Two portions of the crystal are maintained in continuous oscillation by feed-back circuits. These portions change their frequencies by different amounts when the force is changed. The difference between the two frequencies is a very accurate measure of the force and forms the output of the transducer.Structures to secure the crystal have, in the past, proved difficult to manufacture. The present invention describes a securing structure for the crystal which substantially improves and facilitates securing and housing the crystal to provide high accuracy under all normal working conditions of the transducer.

Abstract translation: 力或液体压力传感器包括板状晶体。 待测量的力由设置在晶体相对边缘上的两个座进行施加。 传感器可以在加入隔膜以提供力时测量压力。 晶体的两部分通过反馈电路保持连续振荡。 当力改变时，这些部分将其频率改变不同的量。 两个频率之间的差异是对力的非常精确的测量并形成换能器的输出。 过去证明难以制造晶体的结构。 本发明描述了一种用于晶体的固定结构，其基本上改善并且便于固定和容纳晶体，以在换能器的所有正常工作条件下提供高精度。

公开(公告)号：US4439705A

公开(公告)日：1984-03-27

申请号：US328520

申请日：1981-12-08

Applicant: James P. Corbett

Inventor： James P. Corbett

IPC: G01B7/16 ,  G01L1/16 ,  G01L9/00

CPC classification number: G01L1/162 ,  G01B7/16 ,  G01L9/0022

Abstract: A force or fluid pressure transducer comprises two plate-like crystals. The force is applied to the first of the two crystals in a direction generally along the crystal faces by two seatings situated at opposing edges of the crystal.An oscillating portion of this first crystal changes its frequency by an amount which is a very accurate measure of the force, providing the ambient temperature of the instrument remains constant.The present invention resides in a second crystal secured to the first crystal at particular force insensitive points, there being very small spacing between the two crystals. The second crystal sustains a negligibly small amount of the force and hence a similar oscillating portion of this second crystal undergoes negligibly small frequency change.Means are provided for adjusting the steady-state temperature behavior of one crystal with respect to that of the other in order to remove residual errors.The instrument output signal is formed by generating the difference frequency between the two crystals. This difference frequency changes only negligibly when the instrument is subjected to ambient temperature changes and hence provides superior performance to earlier inventions.

Abstract translation: 力或液体压力传感器包括两个板状晶体。 通过位于晶体的相对边缘处的两个座，大致沿着晶面的方向将力施加到两个晶体中的第一个晶体。 该第一晶体的振荡部分将其频率改变一定量，该量是力的非常准确的量度，从而提供仪器的环境温度保持恒定。 本发明在于在特定的力不敏感点处固定到第一晶体的第二晶体，两个晶体之间的间隔非常小。 第二晶体维持可忽略的少量的力，因此该第二晶体的类似的振荡部分经历可忽略的小的频率变化。 提供了用于调整一个晶体相对于另一个晶体的稳态温度特性的装置，以便消除残余误差。 仪器输出信号通过产生两个晶体之间的差频而形成。 当仪器受到环境温度变化的影响时，这种差异频率变化不大，因此能够为早期的发明提供卓越的性能。

公开(公告)号：US4703216A

公开(公告)日：1987-10-27

申请号：US834383

申请日：1986-02-28

Applicant: James P. Corbett

Inventor： James P. Corbett

IPC: G01L1/16 ,  G01L9/00 ,  H01L41/08

CPC classification number: G01L1/162 ,  G01L9/0022

Abstract: A force and pressure transducer comprises a plate-like crystal. Two separate portions of the crystal are maintained in oscillation at different frequencies by a circuit. The crystal is firmly secured to a solid member in such a manner that deformation in the solid manner, caused by the force or fluid pressure to be measured, results in a secondary force being transmitted to the crystal. This compels the frequency of one of the two oscillating portions of the crystal to change substantially whereas the frequency of the other portion changes only minimally. The difference frequency between the two portions is a highly accurate measure of the force or fluid pressure to be measured.In oscillating crystal transducers hitherto employing plate-like crystals wherein the force to be measured is transmitted along the surface direction, the maximum applicable force has been limited by the ability of the crystal to sustain larger forces.The new development claimed herein permits large forces and fluid pressures to be measured.

Abstract translation: 力和压力传感器包括板状晶体。 晶体的两个独立部分通过电路保持在不同频率的振荡。 晶体牢固地固定在固体部件上，使得由待测量的力或流体压力引起的以固体方式的变形导致二次力传递到晶体。 这迫使晶体的两个振荡部分之一的频率基本上改变，而另一部分的频率仅最小地改变。 两部分之间的差异频率是测量力或流体压力的高精度测量。 在迄今使用板状晶体的振荡晶体传感器中，其中待测量的力沿着表面方向传播，所以最大的适用力受到晶体承受较大的力的能力的限制。 本文所要求的新发展允许测量大的力和流体压力。

公开(公告)号：US4175243A

公开(公告)日：1979-11-20

申请号：US852477

申请日：1977-11-17

Applicant: James P. Corbett

Inventor： James P. Corbett

IPC: G01L1/16 ,  G01L9/00 ,  H01L41/10

CPC classification number: G01L9/0022 ,  G01L1/162 ,  Y10S73/04

Abstract: A fluid pessure transducer comprises a plate-like crystal. The pressure gives rise to a force which is applied by two seatings situated by opposing edges of a crystal in a direction generally along the face of the crystal. The change in oscillating frequencies of a part of the crystal provides a measure of the force and hence the fluid pressure.In the past a second matched crystal has been employed to provide compensation for inaccuracy brought about by undesired frequency deviation due to ambient temperature change of the instrument. The present invention consists of a single crystal having on it two oscillating areas simulating the behaviour of the original pair of crystals. The single crystal facilitates manufacture of the device and improves the accuracy of the instrument.

Abstract translation: 流体静止换能器包括板状晶体。 该压力产生一个力，该力通过沿着晶体的表面的方向由晶体的相对边缘定位的两个座施加。 晶体的一部分的振荡频率的变化提供了力的测量，并因此提供了流体压力的量度。 在过去，已经采用第二匹配晶体来提供由于仪器的环境温度变化引起的由不期望的频率偏差引起的不精确度的补偿。 本发明由单晶构成，其上具有模拟原始晶体对的行为的两个振荡区域。 单晶便于制造器件，提高了仪器的精度。

公开(公告)号：US4126801A

公开(公告)日：1978-11-21

申请号：US734191

申请日：1976-10-20

Applicant: James P. Corbett

Inventor： James P. Corbett

IPC: G01L1/16 ,  G01L9/00 ,  G01L13/02 ,  H01L41/10

CPC classification number: G01L9/0022 ,  G01L1/162 ,  G01L13/025

Abstract: A transducer capable of measuring force or fluid pressure comprises one or more plate-like crystals; electrical means for exciting each crystal into resonance; a base upon which sits a first seating which supports the lower edge of said one crystal; a second seating disposed at the upper edge of the crystal so as to secure the crystal in a position perpendicular to said base; each seating comprising cylindrical or semi-cylindrical surfaces the cylindrical faces of which, are arranged to bear on the crystal edge so as to produce, in response to said force, a change of the resonant frequency of that crystal with respect to the other crystal or crystals.

Abstract translation: 能够测量力或流体压力的换能器包括一个或多个板状晶体; 用于激发每个晶体进入共振的电气装置; 一个基座，其上设有一个支撑所述一个晶体的下边缘的第一座位; 设置在晶体的上边缘处的第二座，以便将晶​​体固定在垂直于所述基底的位置; 每个座部包括圆柱形或半圆柱形表面，其圆柱形表面被布置成承载在晶体边缘上，以便响应于所述力而产生该晶体相对于另一晶体的共振频率的变化，或 晶体。