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    • 1. 发明专利
    • Ultrasonic liquid level detecting device
    • 超声波液位检测装置
    • JPS61120020A
    • 1986-06-07
    • JP24069584
    • 1984-11-16
    • Hitachi Eng Co LtdHitachi Ltd
    • GOTO HIROSHISAKAIGAWA HIROMASAKAKINUMA YUKIO
    • G01F23/296G01F23/28G01N29/00
    • G01F23/28
    • PURPOSE:To detect a liquid level with high precision by calculating an attenuation constant from the height and path of a pulse reflection echo corresponding to the medium in a container and detecting the boundary surface between two media in the container. CONSTITUTION:Ultrasonic wave pulses which are made incident from the external wall of the container 1 by a probe 2 causes multi-path reflection inside and outside the wall of the container and time variation of an echo outputted through the probe 2 and a probe driving circuit 3 is outputted as TB1. Then, a wave memory 11 performs sampling to hold a digital value TB2. Further, digital data is held in a RAM15 through a data I/O 12 and a CPU14. The time when the height of a peak echo appears is detected from those data. Then, peak values A1, A2... and paths T1, T2... of respective reflection echoes are obtained as shown by TB3 and then the attenuation constant is calculated. The obtained attenuation constant is selected in the table of attenuation constants stored in a ROM16 to decide on the name of the corresponding medium, and the medium name, plate thickness, etc., are displayed on a display device.
    • 目的:通过从容器中的介质对应的脉冲反射回波的高度和路径计算衰减常数,并检测容器中两个介质之间的边界面,从而高精度地检测液位。 构成:通过探针2从容器1的外壁入射的超声波脉冲导致容器壁内外的多路反射,并且通过探头2输出的回波的时间变化和探针驱动电路 3作为TB1输出。 然后,波存储器11进行采样以保持数字值TB2。 此外,数字数据通过数据I / O 12和CPU14保持在RAM15中。 从这些数据中检测出峰值回波高度的时间。 然后,如TB3所示,获得各反射回波的峰值A1,A2 ...和路径T1,T2 ...,然后计算衰减常数。 所获得的衰减常数在存储在ROM16中的衰减常数表中选择以决定相应介质的名称,并且介质名称,板厚等显示在显示装置上。
    • 8. 发明专利
    • REMOTE SUPERVISORY SYSTEM
    • JPH0654074A
    • 1994-02-25
    • JP20131692
    • 1992-07-28
    • HITACHI LTDNIPPON TELEGRAPH & TELEPHONE
    • KANEKO KOICHIGOTO HIROSHIMORIYA MICHIAKIYASUDA MINORU
    • H04M11/00H04N7/18
    • PURPOSE:To provide the supervisory system which performs transmission/ reception through the line of an ISDN. CONSTITUTION:A transmitter 400 is provided with an alarm signal detection circuit 43 to detect signals from plural sensors 301-30k for detecting abnormality and to output alarm information, control part 46 to perform an instruction so as to transmit encoded video information from an image encoder 44 and encoded voice information from a voice CODEC 45 when the alarm information comes from the detecting means 43, and line control part 48 to transmit the video information and the voice information through the ISDN to a receiver 60 when the transmission is instructed from the control part 46, and the receiver 60 is provided with a line control part 61 to receive transmitted signals from the transmitter 400, image restoring means 62 to restore the video information of the transmitted signals, voice encoding.restoring means 63 to encode/restore the voice information, video display means 66 to output and display the restored video information, and voice input/output terminal 67 to output the restored voice information.