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发表于 2018-8-23 12:24:45
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最便宜的版本应该是开始停止。所有其他版本需要额外的电路。
基本操作是以接近光速的速度向杆发送脉冲。当发送脉冲时,计数器需要以非常高的频率开始计数。当脉冲到达磁铁时,它会导致波导向后传播。这是通过高速计数器测量的扭转回到变送器的时间。
启动停止的另一个优点是运动控制器控制脉冲沿杆向下发送的时间。这非常重要,因为如果运动控制器控制何时捕获数据,则可以测量数据与速度和加速度之间的时间。
0-10伏和4 = 20ma MTD棒在收到最后一个脉冲后不久发送起始脉冲。脉冲不是定期发送的。这意味着无法计算速度。当发送脉冲时,斜坡电路以恒定速率增加电容器上的电压。返回脉冲到达的时间越长,控制器充电的电压就越大。当返回脉冲到达时,控制器不再充电。这是测量的电压。
早在20世纪80年代,我们制造了可以模拟MTS传感器和气缸进行调试的电路。现在我们使用软件模拟器
The cheapest version should be start stop. All other versions require extra circuitry.
The basic operation is sending a pulse down the rod at the speed near the speed of light. A counter needs to start counting at very high frequencies when the pulse is sent. When the pulse reaches the magnet it causes a twist in the wave guide that travels back. It is the time it takes the twist to travel back to the transmitter that is measured with a high speed counter.
The next advantage of the start stop is that the motion controller controls when the pulse is sent down the rod. This is very important because if the motion controller controls when the data is captured it can measure the time between the data and the speed and acceleration.
0-10 volt and 4=20ma MTD rods sent the start pulse soon after the last pulse is recieved. The pulses are not sent at regular intervals. This means it is impossible to computer the velocity. When the pulse is sent, a ramp circuits increases the voltage on a capacitor at constant rate. The longer it takes the return pulse to arrive, the more the voltage on the capictor charge. When the return pulse arrives, the capictor is no longer charged. This is the voltage that is measured.
Back in the 1980s we made circuits that would simulate a MTS sensor and cylinder for debugging. Now we use software simulators.
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