首页> 外国专利> Ultrasound signal start definition circuitry - forms propagation time and period duration signals using two voltage comparators of differing thresholds

Ultrasound signal start definition circuitry - forms propagation time and period duration signals using two voltage comparators of differing thresholds

机译：超声信号开始定义电路-使用两个阈值不同的电压比较器形成传播时间和周期持续时间信号

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摘要

The circuitry defines the start time point of an ultra-sonic received signal in which the received signal is input to two voltage comparators (6,8) of different thresholds. The comparator (6) has a threshold well above any interference signals and receives the signal 180 deg phase shifted, via a filter (5). The second comparator (8) with a zero volt threshold, receives the signal directly and detects its zero crossings. A logic circuit comprising three flip-flops (7,10,12) produces a cycle signal and a period signal. The exact cycle length is obtained by subteracsubtracting the period signal from the cycle signal and the corrected value is then further processed. Throughflow measurement in gas pipes by measuring propagating time e.g. by ultrasonic transceivers using piezo-electric transducers. USE/ADVANTAGE - measuring devices where only minimal temporal error in relation to sound wave length is permissable. Enables precise definition of start time of ultra-sonic received signal with special command to transducer and special operation of transmitter and receiver.

机译：该电路定义了超声接收信号的开始时间点，其中接收信号被输入到具有不同阈值的两个电压比较器（6,8）。比较器（6）的阈值远高于任何干扰信号，并通过滤波器（5）接收相移180度的信号。具有零伏特阈值的第二比较器（8）直接接收信号并检测其零交叉。包括三个触发器（7、10、12）的逻辑电路产生周期信号和周期信号。通过从周期信号中减去周期信号，可以获得准确的周期长度，然后对校正值进行进一步处理。通过测量传播时间来测量燃气管道中的流量，例如超声波收发器使用压电换能器。使用/优点-仅允许相对于声波长度的最小时间误差的测量设备。通过对变送器的特殊命令以及对发射器和接收器的特殊操作，可以精确定义超声波接收信号的开始时间。

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公开/公告号DE4017021A1

专利类型
公开/公告日1991-07-04

原文格式PDF
申请/专利权人 BRENNSTOFFINSTITUT FREIBERG O-9200 FREIBERG DE;
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申请/专利号DE19904017021
发明设计人 WAGNER DIETER DR.-ING. O-9388 OEDERAN DE;BECKER DIETER DR.-ING. O-9200 FREIBERG DE;WOLF JOHANNES DR.-ING. O-7060 LEIPZIG DE;
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申请日1990-05-26
分类号G01S11/14;
国家 DE
入库时间 2022-08-22 05:49:10

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