公开(公告)号：US5020373A

公开(公告)日：1991-06-04

申请号：US446415

申请日：1989-12-05

申请人： Shoji Kamiunten ,  Tetsuo Hisanaga

发明人： Shoji Kamiunten ,  Tetsuo Hisanaga

IPC分类号： G01F1/00 ,  G01F1/32 ,  G01F1/68 ,  G01F1/684 ,  G01F1/696 ,  G01F7/00

CPC分类号： G01F1/3209 ,  G01F1/6842 ,  G01F7/00

摘要： This flow meter uses two known flow responsive techniques and combines them in a unique structure and system to form an improved flow meter whose range extends from low to high flow rates. The meter comprises a flow tube with a region of reduced diameter between its inlet and outlet. A microbridge flow sensor of a suitable type known in the art, which responds to thermal changes caused by changes in the flow rate, is located in the region of reduced diameter. A post downstream of the microbridge sensor creates Karman vortices whose frequencies are a function of flow rate and which are detected through ports in the tube by a suitable detector. The output of the microbridge is linear from low flow rates to a mid range and the Karman flow meter output is linear from the mid range to high flow rates. A correction factor is applied to the thermal flow meter output. The correction factor is determined by a ratio of the Karman flow meter output to the thermal output for a flow rate in the mid range, allowing a smooth transition from thermal to Karman outputs and vice versa in the mid range.

公开(公告)号：US5076099A

公开(公告)日：1991-12-31

申请号：US564535

申请日：1990-08-07

申请人： Tetsuo Hisanaga ,  Shigeru Aoshima

发明人： Tetsuo Hisanaga ,  Shigeru Aoshima

IPC分类号： G01F1/68 ,  G01F1/696 ,  G01F1/698 ,  G01F25/00 ,  G01P5/10 ,  G01P21/02

CPC分类号： G01F25/0007 ,  G01F1/6965 ,  G01F1/698 ,  G01P21/025 ,  G01P5/10

摘要： A zero point compensating circuit for a microbridge flow meter including an upstream thermal sensor means, a downstream thermal sensor means and a heater means located between said upstream and downstream thermal sensor is provided which comprises a first switch coupled to said heater for turning on and off the same and a current supply circuit coupled to said upstream and downstream thermal sensors for selectively supplying the same with a first current when said first switch is closed and a second current larger than said first current when said first switch is opened such that said upstream and downstream thermal sensors reach a temperature to which they are heated when said heater is on in no flow condition. Thus, an offset caused by discrepancy in the resistance value and thermal coefficients of resistance (TCR) of the upstream and downstream temperature sensors can be removed by the above circuit, thereby making it possible to achieve a precise measurement of small flow rates of a fluid of interest.

公开(公告)号：US5072614A

公开(公告)日：1991-12-17

申请号：US478611

申请日：1990-02-12

申请人： Tetsuo Hisanaga

发明人： Tetsuo Hisanaga

IPC分类号： G01P5/12 ,  G01D3/036 ,  G01F1/684 ,  G01F1/698 ,  G01P1/00

CPC分类号： G01F1/698 ,  G01D3/0365 ,  G01F1/6845 ,  G01P1/006

摘要： A temperature compensating circuit having a third temperature sensor element for detecting an ambient temperature disposed on the same substrate on which first and second temperature sensor elements are located, and a voltage across the third sensor element, generated by supplying a current thereto, is applied to the first and second sensor elements. Therefore, a voltage applied to first and second sensor elements is automatically changed corresponding to change in ambient temperature, and accordingly a difference in temperature between first and second sensor elements can be precisely detected in a form of voltage signal.

公开(公告)号：US4992724A

公开(公告)日：1991-02-12

申请号：US481893

申请日：1990-02-20

申请人： Tetsuo Hisanaga ,  Hiroshi Hatanaka

发明人： Tetsuo Hisanaga ,  Hiroshi Hatanaka

IPC分类号： G01B7/16 ,  H03M1/48 ,  H03M1/78

CPC分类号： H03M1/48 ,  G01B7/18 ,  H03M1/785

摘要： A bridge balancing circuit includes a bridge having a resistance change type sensor, a differential amplifier for extracting a voltage difference across two central nodes of the bridge, a comparator connected to the output terminal of the differential amplifier, a D/A converter an output terminal of which is connected to one of the two central nodes, and a controller for controlling the D/A converter. The differential amplifier and the comparator automatically detect a balanced point of the bridge, and the controller maintains a balanced state of the bridge.

摘要翻译： 桥接平衡电路包括具有电阻变化型传感器的桥，用于提取跨桥的两个中心节点的电压差的差分放大器，连接到差分放大器的输出端的比较器，D / A转换器，输出端 其连接到两个中央节点中的一个，以及用于控制D / A转换器的控制器。 差分放大器和比较器自动检测桥的平衡点，并且控制器保持桥的平衡状态。

公开(公告)号：US5485150A

公开(公告)日：1996-01-16

申请号：US956797

申请日：1992-10-05

申请人： Tetsuo Hisanaga ,  Tetsuya Kajita

发明人： Tetsuo Hisanaga ,  Tetsuya Kajita

IPC分类号： G01F15/07 ,  G01D4/00 ,  G08C17/04 ,  G08C19/00 ,  G08B23/00 ,  G08C15/06

CPC分类号： G01D4/006 ,  G08C17/04 ,  Y02B90/243 ,  Y04S20/325

摘要： A remote data read system includes a plurality of accumulators including first transmission/reception sections of an electromagnetic induction type, and a handy terminal including a second transmission/reception section of an electromagnetic induction type. The plurality of accumulators accumulate accumulation values representing amounts of consumed power, gas, tap water, or the like, and output accumulated value data in response to data request signals transmitted thereto. The first transmission/reception sections receive external data request signals, and output accumulation value data in response to the data request signal. The handy terminal outputs the data request signal to read an accumulation value from the accumulator and displays input accumulation value data. The second transmission/reception section outputs the data request signal to the first transmission/reception section, and receives the accumulation value data output from the first transmission/reception section.

摘要翻译： 远程数据读取系统包括多个累积器，其包括电磁感应型的第一发送/接收部分，以及包括电磁感应型的第二发送/接收部分的方便终端。 多个累加器积累代表消耗功率，气体，自来水等的累积值，并且响应于发送到其的数据请求信号而输出累积值数据。 第一发送/接收部分接收外部数据请求信号，并响应于数据请求信号输出累加值数据。 便携式终端输出数据请求信号，从累加器读取累积值，并显示输入累积值数据。 第二发送/接收部分将数据请求信号输出到第一发送/接收部分，并且接收从第一发送/接收部分输出的累加值数据。