公开(公告)号：US5412330A

公开(公告)日：1995-05-02

申请号：US77905

申请日：1993-06-16

申请人： Mihir K. Ravel ,  Michael D. Jones ,  Steven H. Pepper

发明人： Mihir K. Ravel ,  Michael D. Jones ,  Steven H. Pepper

IPC分类号： G01R31/302 ,  G01R31/308 ,  G01R31/02

CPC分类号： G01R31/308

摘要： An optical module for an optically based measurement system, such as an electro-optic system (10) for measuring electrical characteristics of a device under test (14), has a probe arm (26), a layer of electro-optic material (27), and a first optical system for delivering a measurement beam (44) to the layer and for producing therefrom an information-carrying beam having optical characteristics indicative of the electric characteristics. The first optical system includes a first lens (128), and (optional) polarization bias adjustment (130), a dichroic beamsplitter (112), and a second lens (114). The module also has a second optical system for delivering an observation beam (66) through the layer and onto a portion (68) of the device and for forming from rays (69) stemming from the observation beam a light pattern (70) indicative of the portion. The information-carrying beam is analyzed in a polarization analysis module into component beams (136, 138) in respective linearly independent polarization states. Converters (144, 146) produce electrical signals (147, 148) indicative of the intensity of the respective component beams; alternatively, the component beams are conveyed for analysis elsewhere. Connections (46, 65, 74, 149, 150) to and from the components fixedly mounted relative to the probe arm are flexible, allowing the probe arm and the components to move freely in any direction relative to the device under test.

摘要翻译： 用于光学测量系统的光学模块，例如用于测量被测设备（14）的电特性的电光系统（10），具有探针臂（26），电光材料层（27） ）和第一光学系统，用于将测量光束（44）传送到所述层并由其产生具有指示电特性的光学特性的信息载体束。 第一光学系统包括第一透镜（128）和（可选的）偏振偏置调节（130），二向色分束器（112）和第二透镜（114）。 该模块还具有第二光学系统，用于将观察光束（66）穿过该层并传递到该装置的一部分（68）上，并且用于从源自观察光束的光线（69）形成指示 的部分。 在偏振分析模块中将信息载体束分解成各自的线性独立极化状态的分量束（136,138）。 转换器（144,146）产生指示相应部件光束的强度的电信号（147,148）。 或者，分量束被传送以在其他地方进行分析。 相对于探针臂固定安装的组件的连接（46,65,74,149,150）是柔性的，允许探针臂和组件相对于被测设备在任何方向上自由移动。

公开(公告)号：US06507624B1

公开(公告)日：2003-01-14

申请号：US09296438

申请日：1999-04-21

申请人： Stephen P. Jachim ,  Mihir K. Ravel ,  Steven H. Pepper

发明人： Stephen P. Jachim ,  Mihir K. Ravel ,  Steven H. Pepper

IPC分类号： H03K900

CPC分类号： G01R23/165

摘要： A bandpass sampling system (10) of this invention employs a conventional mixer (14) driven by a frequency-tunable LO (16) to upconvert a signal frequency band to an IF frequency band that is above the signal frequency band. The IF frequency band is passed through an IF bandpass filter (18) to provide to subsequent digitization stages (20, 24) an IF bandpass range of signal frequency components. In this architecture, the IF bandpass filter acts as an anti-alias filter for the digitization stages. The LO frequency is selected to place the upconverted signal frequency band within the pass band of the IF bandpass filter. The resultant IF bandpass signal is sampled and digitized at a rate that is commensurate with the IF bandwidth, but typically much lower than the IF bandpass center frequency. Signal sampling is carried out by a sample-and-hold or a track-and-hold circuit (20), the output of which is applied to an ADC (24) that is clocked (22) at the same rate as the sampling circuit.

摘要翻译： 本发明的带通采样系统（10）采用由频率可调LO（16）驱动的常规混频器（14）将信号频带上变频到高于信号频带的IF频带。 IF频带通过IF带通滤波器（18）以提供随后的数字化级（20,24）IF信号频率分量的IF带通范围。 在这种架构中，IF带通滤波器作为数字化阶段的抗混叠滤波器。 选择LO频率将上变频信号频带置于IF带通滤波器的通带内。 所得到的IF带通信号以与IF带宽相当的速率被采样和数字化，但通常远低于IF带通中心频率。 信号采样由采样保持或跟踪和保持电路（20）执行，其输出被施加到以与采样电路相同的速率（22）被计时（22）的ADC（24） 。

公开(公告)号：US5488866A

公开(公告)日：1996-02-06

申请号：US225867

申请日：1994-04-11

申请人： Mihir K. Ravel ,  Steven H. Pepper

发明人： Mihir K. Ravel ,  Steven H. Pepper

IPC分类号： G01N29/00 ,  G01N29/02 ,  G01N29/036 ,  G01N29/12 ,  G01N29/08

CPC分类号： G01N29/036 ,  G01N29/022 ,  G01N29/12 ,  G01N2291/014 ,  G01N2291/0256 ,  G01N2291/0423 ,  G01N2291/0426 ,  G01N2291/048 ,  G01N2291/106

摘要： A time-interleaved method for efficient operation of an acoustic wave sensor array couples each sensor repetitively and one at a time via a digitally-addressable analog switch, or multiplexer, to a single oscillator driver to form an oscillation circuit. A frequency of oscillation for each acoustic wave sensor is determined. The frequency for each acoustic wave sensor then is converted into a measurement value for the parameter to which each acoustic wave sensor is sensitive.

摘要翻译： 用于声波传感器阵列的有效操作的时间交替方法将每个传感器经由数字寻址模拟开关或多路复用器重复地和一次一个地耦合到单个振荡器驱动器以形成振荡电路。 确定每个声波传感器的振荡频率。 然后，每个声波传感器的频率被转换成每个声波传感器敏感的参数的测量值。

公开(公告)号：US5406829A

公开(公告)日：1995-04-18

申请号：US229899

申请日：1994-04-19

申请人： Mihir K. Ravel ,  Steven H. Pepper

发明人： Mihir K. Ravel ,  Steven H. Pepper

IPC分类号： G01N29/12 ,  G01N29/00 ,  G05D23/20 ,  G01N31/06 ,  G01K11/22

CPC分类号： G05D23/20 ,  G05D23/1928

摘要： A temperature control system for acoustic wave chemical sensors monitors the frequency output from a reference sensor packaged within a heat conductive case with a test sensor. Since the frequency output fluctuates as a function of temperature, variations in frequency from a nominal value representing a desired steady state temperature for the sensors are detected and used as a control signal for a heating element attached to the heat conductive case.

摘要翻译： 用于声波化学传感器的温度控制系统利用测试传感器来监测包封在导热壳内的参考传感器的频率输出。 由于频率输出随着温度的变化而变动，所以检测到代表传感器的期望稳态温度的标称值的频率变化，并将其用作连接到导热壳体上的加热元件的控制信号。