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    • 4. 发明申请
    • ANALOG TRANSDUCER CIRCUIT WITH DIGITAL CONTROL
    • 具有数字控制的模拟转换器电路
    • WO1988001417A1
    • 1988-02-25
    • PCT/US1987001942
    • 1987-08-12
    • ROSEMOUNT INC.
    • ROSEMOUNT INC.FRICK, Roger, L.
    • G08C19/10
    • G08C19/02
    • A two wire transmitter (10) controls loop current as a function of a sensed parameter such as pressure or temperature using analog sensing and signal processing circuitry. Corrections, such as for zero, span, and linearity are provided in the form of analog correction signals by a digital circuit which includes a nonvolatile memory (36), a microcomputer (32), and a digitial-to-analog (D/A) converter (26). The microprocessor (32) controls the D/A converter (26) as a function of stored digital correction values to produce the analog correction signals used by the analog signal processing circuitry to control the magnitude of the loop current flowing through the two wire transmitter (10).
    • 双线发射器(10)使用模拟感测和信号处理电路控制回路电流作为感测参数(例如压力或温度)的函数。 通过包括非易失性存储器(36),微计算机(32)和数模(D / A)的数字电路以模拟校正信号的形式提供诸如零,跨度和线性的校正 )转换器(26)。 微处理器(32)根据所存储的数字校正值来控制D / A转换器(26),以产生由模拟信号处理电路使用的模拟校正信号,以控制流过双线发射机的环路电流的大小 10)。
    • 5. 发明申请
    • OPTICAL SWITCH WITH 3D WAVEGUIDES
    • WO2003075062A3
    • 2003-09-12
    • PCT/US2003/006658
    • 2003-03-03
    • ROSEMOUNT INC.
    • FRICK, Roger, L.
    • G02B6/35
    • An optical switch for routing optical signals between optical fibers is shown. Signals are guided internally in an optically transparent substrate (206) by buried waveguides that are directly coupled to the optical fibers. These waveguides form a 3-dimensional optical routing structure internal to the substrate. Signals are coupled between adjacent waveguides by total internal reflection (TIRI) at the internal reflection region (213). A moveable diffraction grating (208) is coupled to these optical signals at points of total internal reflection via evanescent coupling. This coupling causes a change in direction of the optical signal (202) and routes the signal to the desired waveguide (210). Known techniques can be used to form the waveguides (204, 210, 214) by writing them with a pulsed laser. Local heating causes a permanent increase in refractive index that forms a single mode waveguide structure. The resulting device has low losses and can be formed by low cost MEMs processes.
    • 6. 发明申请
    • OPTICAL SWITCH WITH MOVEABLE HOLOGRAPHIC OPTICAL ELEMENT
    • 具有可移动光学元件的光学开关
    • WO2003007051A2
    • 2003-01-23
    • PCT/US2002/013343
    • 2002-04-25
    • ROSEMOUNT INC.
    • FRICK, Roger, L.WILLCOX, Charles, R.
    • G02B26/02
    • G02B6/3536G02B5/32G02B6/124G02B6/1245G02B6/136G02B6/3582G02B6/4214G02B2006/12164
    • An optical switch formed of a holographic optical element (HOE) disposed above a top surface of a substrate and moveable relative thereto is shown. Light is traveling through the substrate under total internal reflection, which creates an evanescent field extending beyond the reflecting surfaces of the substrate. The HOE is characterized, in one embodiment, by being formed from a plurality of strips that are moveable between a first position in which the strips are above the evanescent field and a second position in which the strips are inside the evanescent field. In the first position, the light in the substrate propagates unaffected by the HOE in a primary direction of propagation. In the second position, the light in the substrate is altered by the HOE and made to propagate in a reflected direction oblique to that of the primary direction of propagation.
    • 示出了由全息光学元件(HOE)形成的光学开关,其设置在基板的顶表面上方并且可相对于其移动。 光在全内反射下穿过衬底,这产生延伸超过衬底的反射表面的消逝场。 HOE的特征在于,在一个实施例中,通过由多个条形成,所述多个条可以在其中条带在消逝场之上的第一位置和其中条带在消逝场内的第二位置之间移动。 在第一位置,衬底中的光在主传播方向上传播不受HOE的影响。 在第二位置,衬底中的光被HOE改变,并使其沿与主要传播方向相反的反射方向传播。