Phase difference measuring apparatus for measuring phase difference
between input signals
    84.
    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
    85.
    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。

    Process for producing polyurethane foam with high curing rate
    87.
    发明授权
    Process for producing polyurethane foam with high curing rate 失效
    具有高固化速度的聚氨酯泡沫的生产工艺

    公开(公告)号:US5591781A

    公开(公告)日:1997-01-07

    申请号:US328064

    申请日:1994-10-24

    Abstract: A process for producing a flexible or rigid polyurethane foam is provided in which a polyol and a polyisocyante are reacted in the presence of an amine catalyst, a blowing agent, and a foam stabilizer, the amine catalyst comprising at least one amine compound represented by General Formula (1) below: ##STR1## where R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are respectively an alkyl group of 1 to 6 carbons independently; n is an integer of 0 or 1; and A is an alkyl group of 11 to 14 carbons when n is 0, or an alkylene group of 10 to 15 carbons when n is 1. The amine catalyst has low odor and low volatility, and gives high curing rate, and excellent moldability with a formulation of reduced fluorocarbon and increased water as the blowing agent.

    Abstract translation: 提供了一种制备柔性或硬质聚氨酯泡沫的方法,其中多元醇和多异氰酸酯在胺催化剂,发泡剂和泡沫稳定剂的存在下反应,胺催化剂包含至少一种由General (1)其中R1,R2,R3和R4分别独立地为1至6个碳原子的烷基; n为0或1的整数; 当n为0时,A为11〜14个碳的烷基,n为1时为碳数为10〜15的亚烷基。胺催化剂的气味低,挥发性低,成型性优异, 作为发泡剂的还原氟碳化合物和增加的水的制剂。

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