-
公开(公告)号：US4636792A
公开(公告)日：1987-01-13
申请号：US626803
申请日：1984-07-02
CPC分类号： G01B7/30 , G01D5/2412
摘要： A transducer for sensing the angular position of a shaft over a limited angle (e.g., .+-.30.degree.) uses a printed circuit board mounted perpendicular to the shaft between capacitor plates of a bifurcated vane clamped to the shaft. The board has two pairs of symmetrical capacitor plates, one pair on each side with each plate of a pair located symmetrically with respect to the midposition of the vane plates, and corresponding plates of each pair connected together at a junction to place the two corresponding variable capacitors in parallel. Circuitry produces a Mark-Space signal proportional to the position of the bifurcated vane. Using the total Mark-Space period to continually derive a midposition reference, and comparing that midposition reference to any deviation of equal Mark and Space periods provides a position signal proportional to deviation from midposition of the bifurcated vane. By offsetting the midposition reference signal, the position output signal will be proportional to the position of the plates of the bifurcated vane with respect to the circuit board plates from one extreme to the other.
摘要翻译： 用于感测轴在有限角度（例如，+/- 30°）的角位置的换能器使用垂直于轴的电路板安装在夹在轴上的分叉叶片的电容器板之间。 该电路板有两对对称的电容器板，每侧有一对，每对板对于相对于叶片板的中间对称位置，每对的相应板在连接处连接在一起以将两个对应的变量 电容并联。 电路产生与分叉叶片的位置成比例的马克 - 空间信号。 使用总标记 - 空间周期连续地导出中间位置参考，并且将中间位置参考与相等的标记和空间周期的任何偏差进行比较，提供与偏离分叉叶片的中间偏差成比例的位置信号。 通过偏移中间位置参考信号，位置输出信号将与分叉叶片的板相对于电路板板从一个极限到另一个的位置成比例。
-
公开(公告)号：US4809558A
公开(公告)日：1989-03-07
申请号：US19444
申请日：1987-02-27
IPC分类号： G01F1/32
CPC分类号： G01F1/329
摘要： A method and apparatus for increasing the resolution and accuracy of flow measurements made by vortex flowmeters. A signal conditioning circuit connected to a vortex sensor generates a vortex signal having a period that varies with the frequency of the vortex street. The period of this vortex signal is measured by a period sampling circuit, which generates a vortex period signal. When a programmable control circuit determines that the change in the frequency indicated by successive values of the vortex period signal is relatively small, the displayed flow value is based on the current frequency of the vortex signal; when the change in frequency indicated by successive values of the vortex period signal is relatively large, the displayed flow value is based on the running average frequency of the vortex signal.
摘要翻译： 一种提高涡街流量计流量测量分辨率和精度的方法和装置。 连接到涡流传感器的信号调节电路产生具有随着涡街的频率而变化的周期的涡流信号。 该涡流信号的周期由周期采样电路测量，其产生涡流周期信号。 当可编程控制电路确定由涡流周期信号的连续值指示的频率变化相对较小时，所显示的流量值基于涡流信号的当前频率; 当由涡流周期信号的连续值表示的频率变化相对较大时，显示的流量值基于涡流信号的运行平均频率。
-
公开(公告)号：US4488440A
公开(公告)日：1984-12-18
申请号：US472531
申请日：1983-03-07
IPC分类号： G01F15/06
CPC分类号： G01F15/063
摘要： A totalizer of the decade counter type or the like which, when being pulsed, tends to drain a battery, where the battery and totalizer are remotely located. The battery thus needs to have a long life because of its remote location. The same is effected by a circuit including a voltage regulator which holds average power constant, at least from pulse to pulse.
摘要翻译： 十进位计数器类型等的累加器，其在被脉冲时容易排出电池，电池和累加器位于远处。 因此，电池因其远程位置而需要较长的使用寿命。 这也是由包括稳压器的电路实现的，电压调节器保持至少从脉冲到脉冲的平均功率常数。
-
公开(公告)号：US4372168A
公开(公告)日：1983-02-08
申请号：US271396
申请日：1981-06-08
IPC分类号： G01F1/66
CPC分类号： G01F1/667
摘要： An ultrasonic flowmeter including two phase locked loops with four voltage controlled oscillators, a portion of each loop forming a common path through amplifiers, an electronic attenuator with automatic gain control, a pulse detector, and a pulse or phase comparator. The pulse comparator, through switches, controls the voltage controlled oscillators on a time shared basis. The voltage controlled oscillators are always driven until a later counter pulse coincides with a corresponding received pulse. Time sharing is, in part, accomplished by beginning energy propagation in opposite directions at successive times and before either pulse is received. The oscillators are also alternated to eliminate a zero frequency shift by transmitting alternately at higher and lower frequencies from each transducer.
摘要翻译： 超声波流量计包括具有四个压控振荡器的两个锁相环，每个环路的一部分通过放大器形成公共路径，具有自动增益控制的电子衰减器，脉冲检测器和脉冲或相位比较器。 脉冲比较器通过开关可以分时控制压控振荡器。 电压控制的振荡器总是被驱动，直到稍后的计数脉冲与相应的接收脉冲一致。 时间共享部分地通过在连续的时间和在接收到任一脉冲之前在相反方向上开始能量传播来实现。 振荡器也可以交替地通过从每个换能器以较高和较低的频率交替地发送零频移。
-
公开(公告)号：US4185498A
公开(公告)日：1980-01-29
申请号：US926260
申请日：1978-07-20
IPC分类号： G01F1/66
CPC分类号： G01F1/66 , G01N2291/02836
摘要： A flowmeter sometimes called ultrasonic, but sometimes not ultrasonic including two phase locked loops, a portion of each of which form a common path through amplifiers, an electronic attenuator with automatic gain control, a pulse detector, and a pulse or phase comparator. The pulse comparator, through switches, controls first and second voltage controlled oscillators on a time shared basis. First and second counters are connected from the first and second voltage controlled oscillators, respectively. The first and second counters supply transmission pulses to submerged first and second facing transducers, respectively, at different times. The voltage controlled oscillators are always driven until a later counter pulse coincides with a corresponding received pulse. Time sharing is, in part, accomplished by beginning energy propagation in opposite directions at successive times and before either pulse is received.
摘要翻译： 有时称为超声波，但有时不包括两个锁相环的流量计，其中每个的一部分通过放大器形成公共路径，具有自动增益控制的电子衰减器，脉冲检测器和脉冲或相位比较器。 脉冲比较器通过开关在时间上共同控制第一和第二压控振荡器。 第一和第二计数器分别从第一和第二压控振荡器连接。 第一和第二计数器在不同时间分别向浸没的第一和第二面对换能器提供传输脉冲。 电压控制的振荡器总是被驱动，直到稍后的计数脉冲与相应的接收脉冲一致。 时间共享部分地通过在连续的时间和在接收到任一脉冲之前在相反方向上开始能量传播来实现。
-
-
-
-
搜索结果
5 条记录 (耗时 0.012 秒)
