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    • 4. 发明申请
    • A MULTIVARIABLE TRANSMITTER
    • 多功能发射机
    • WO0151896A8
    • 2001-11-01
    • PCT/US0101375
    • 2001-01-16
    • FOXBORO COHAMILTON GORDON LALLSTROM PETER
    • HAMILTON GORDON LALLSTROM PETER
    • G01F1/36G01F1/37G01F1/38G01F1/50G01K1/02G01L9/08G01L19/00
    • G01K1/028G01F1/363G01F1/372G01F1/383G01F1/50
    • The systems described herein include a multivariable transmitter with one or more bridge sensors for measuring absolute pressure, differential pressure, and temperature of a process fluid in a pipe. In order to reduce current draw, the sensors are excited one at a time, each during an on period of a drive signal. Each sensor output is captured by a gated integrator that is coupled to the sensor output within the on period. The gated integrator stores a value representative of the sensor output on a node that may then be sampled by an analog-to-digital converter. Using this approach, the analog-to-digital converter may sample at a frequency independent of the frequency of the sensor drive signal. For example, the analog-to-digital converter may sample at a frequency that is less than one-half the frequency of the on period, in order to avoid certain artifacts of the digitization process. The systems described herein also include a technique for ratiometric calibration of a data acquisition system that, independent of true voltages for sensor measurements, can reproduce highly accurate results from ratiometric sensors such as bridges.
    • 本文所述的系统包括具有一个或多个桥接传感器的多变量变送器,用于测量管道中的过程流体的绝对压力,差压和温度。 为了减少电流消耗,传感器在驱动信号的导通周期中一次一个激励。 每个传感器输出由门控积分器捕获,该积分器在接通时间段内耦合到传感器输出。 门控积分器将代表传感器输出的值存储在节点上,然后可以由模数转换器对其进行采样。 使用该方法,模数转换器可以以与传感器驱动信号的频率无关的频率进行采样。 例如,模数转换器可以以小于开启周期的频率的一半的频率进行采样,以避免数字化处理的某些伪影。 本文描述的系统还包括用于数据采集系统的比例校准的技术,其独立于用于传感器测量的真实电压可以再现来自诸如桥的比例传感器的高精度结果。
    • 5. 发明申请
    • A MULTIVARIABLE TRANSMITTER
    • 多变量翻译
    • WO01051896A1
    • 2001-07-19
    • PCT/US2001/001375
    • 2001-01-16
    • G01F1/36G01F1/37G01F1/38G01F1/50G01K1/02G01L9/08G01L19/00
    • G01K1/028G01F1/363G01F1/372G01F1/383G01F1/50
    • The systems described herein include a multivariable transmitter with one or more bridge sensors for measuring absolute pressure, differential pressure, and temperature of a process fluid in a pipe. In order to reduce current draw, the sensors are excited one at a time, each during an on period of a drive signal. Each sensor output is captured by a gated integrator that is coupled to the sensor output within the on period. The gated integrator stores a value representative of the sensor output on a node that may then be sampled by an analog-to-digital converter. Using this approach, the analog-to-digital converter may sample at a frequency independent of the frequency of the sensor drive signal. For example, the analog-to-digital converter may sample at a frequency that is less than one-half the frequency of the on period, in order to avoid certain artifacts of the digitization process. The systems described herein also include a technique for ratiometric calibration of a data acquisition system that, independent of true voltages for sensor measurements, can reproduce highly accurate results from ratiometric sensors such as bridges.
    • 一种系统包括具有一个或多个桥传感器的多变量转换器,用于测量管道中绝对压力,压差和过程流体的温度。 为了减少电流消耗,传感器一次一个地通电,每个传感器在激活驱动信号期间通电。 在激活期间,每个传感器输出都由连接到传感器输出的触发积分器捕获。 触发积分器将表示传感器输出的值存储在节点上,然后可以通过模数转换器进行采样。 采用这种方法,模数转换器可以以与传感器的驱动信号频率无关的频率进行采样。 例如,模数转换器可以以小于激活周期的一半频率的频率进行采样,以避免扫描过程的某些伪影。 本发明的系统还包括数据采集系统的比例式校准技术,该技术独立于实际的传感器测量电压,可以从诸如桥的比率式传感器再现高度准确的结果。