Phase difference measuring apparatus for measuring phase difference
between input signals
    1.
    发明授权
    Phase difference measuring apparatus for measuring phase difference between input signals 失效
    用于测量输入信号之间的相位差的相位差测量装置

    公开(公告)号:US5844408A

    公开(公告)日:1998-12-01

    申请号:US806161

    申请日:1997-02-25

    CPC classification number: G01F1/8431 G01F1/8436

    Abstract: A phase difference measuring apparatus for precisely measuring a phase difference between two input signals having the same frequency sent from, for example, a Coriolis type mass flowmeter. A differential amplifier in the apparatus provides the sum or difference of the two input signals and a multiplexor sequentially selects and outputs to an A/D converter the two input signals and the output of the differential amplifier. The A/D converter converts the output of the multiplexor into digital data and a digital signal processor or a microcomputer calculates the phase difference between the two input signals based on the converted digital data. The apparatus may further comprise a function that an error caused by the difference of the transfer characteristics of a filter and the A/D converter is compensated using a reference signal which is selected from the two input signals.

    Abstract translation: 一种用于精确测量由例如科里奥利型质量流量计发送的具有相同频率的两个输入信号之间的相位差的相位差测量装置。 装置中的差分放大器提供两个输入信号的和或差,并且多路复用器顺序地选择并输出到A / D转换器的两个输入信号和差分放大器的输出。 A / D转换器将多路复用器的输出转换成数字数据,数字信号处理器或微型计算机基于转换的数字数据计算两个输入信号之间的相位差。 该装置还可以包括使用从两个输入信号中选择的参考信号来补偿由滤波器和A / D转换器的传送特性的差异引起的误差的功能。

    Phase difference measuring apparatus and mass flowmeter thereof
    2.
    发明授权
    Phase difference measuring apparatus and mass flowmeter thereof 失效
    相差测量装置及其质量流量计

    公开(公告)号:US5767665A

    公开(公告)日:1998-06-16

    申请号:US526706

    申请日:1995-09-12

    Abstract: A phase difference measuring apparatus for accurately measuring the phase difference (fine time difference) of two signals with the same frequency with a reduced number of bits for A/D conversion is disclosed. In addition to output signals of an upstream side pickup and a downstream side pickup of a mass flowmeter, an output signal of the upstream side pickup or the downstream side pickup is supplied to a comparator, a PLL circuit, an antialiase filter, a sample and hold circuit, and an A/D converter. These circuits quantize these signals and send the quantized signals to a band pass filter. The band pass filter extracts a predetermined signal component and outputs it to a DFT. The DFT performs complex Fourier transformation on the input signal. Thus, the phase difference between two signals with the same frequency (such as an upstream side pickup signal and a downstream side pickup signal) can be accurately detected with a reduced number of bits for each of the A/D converters.

    Abstract translation: 公开了一种相位差测量装置,用于以A / D转换的比特数精确地测量具有相同频率的两个信号的相位差(精细时间差)。 除了质量流量计的上游侧拾取器和下游侧拾取器的输出信号之外,上游侧拾取器或下游侧拾取器的输出信号被提供给比较器,PLL电路,抗混叠滤波器,样本和 保持电路和A / D转换器。 这些电路对这些信号进行量化,并将量化的信号发送到带通滤波器。 带通滤波器提取预定的信号分量并将其输出到DF​​T。 DFT对输入信号进行复数傅里叶变换。 因此,可以以每个A / D转换器的位数减少来精确地检测具有相同频率的两个信号(诸如上游侧拾取信号和下游侧拾取信号)之间的相位差。

    Spectrophotometer
    3.
    发明授权
    Spectrophotometer 有权
    分光光度计

    公开(公告)号:US08767204B2

    公开(公告)日:2014-07-01

    申请号:US13493736

    申请日:2012-06-11

    CPC classification number: G01J3/08 G01J3/027 G01J3/42

    Abstract: A spectrophotometer 10 includes built-in detector 24 and external detector 32. When a mountable/removable optical path switcher 23a is installed in a specimen chamber 23, measurement based on detection signals from built-in detector 24 is replaced by measurement based on detection signals from external detector 32. The spectrophotometer further includes a measurement data threshold-value storage unit 51 that stores threshold value T for measurement data from built-in detector 24 or external detector 32, and a light-receiving detector recognition unit 52 that recognizes which detector is able to receive the measuring light beam based on the results of a comparison between threshold value T and measurement data from built-in detector 24 or external detector 32 while the measuring light beam is being introduced into specimen chamber 23.

    Abstract translation: 分光光度计10包括内置检测器24和外部检测器32.当将可安装/可拆卸光路切换器23a安装在样本室23中时,基于来自内置检测器24的检测信号的测量被基于检测信号 分光光度计还包括测量数据阈值存储单元51,其存储来自内置检测器24或外部检测器32的测量数据的阈值T,以及光接收检测器识别单元52,其识别哪个检测器 能够基于来自内置检测器24或外部检测器32的阈值T与测量数据之间的比较结果同时测量光束被引入到样本室23中而接收测量光束。

Patent Agency Ranking