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    • 1. 发明授权
    • Techniques for measuring difference of an optical property at two
wavelengths by modulating two sources to have opposite-phase components
at a common frequency
    • 通过调制两个源以在相同频率处具有相位分量来测量两个波长的光学性质的差异的技术
    • US5774213A
    • 1998-06-30
    • US518427
    • 1995-08-23
    • Rick P. TrebinoNicholas M. SampasEric K. Gustafson
    • Rick P. TrebinoNicholas M. SampasEric K. Gustafson
    • G01N21/31
    • G01N21/3151
    • A technique for making precise spectrophotometric measurements illuminates a sample with two or more modulated light sources at two or more, typically closely spaced, wavelengths. Light from the sources is combined, homogenized, and directed to the sample, and the light from the sample is collected and detected by a photodetector. The optical output powers of two sources are modulated with the same periodicity and with a reversed amplitude. Variations in the concentrations of species in the sample affect the modulation amplitude representing the sum of the optical powers from two sources in such a way as to produce an output signal. That output signal, based on an electrical component varying with a periodicity at the fundamental frequency, provides a measure of the difference in the transmissions (or other optical properties) of the sample at the two wavelengths. Feedback methods, such as null-point detection, provide stable, sensitive measurements. Wavelength-division multiplexing--required for simultaneous measurements at many wavelengths--is achieved by modulating different pairs of sources at different frequencies.
    • 用于进行精确的分光光度测量的技术用两个或更多个通常紧密间隔的波长的两个或多个调制光源照射样品。 来自源的光被组合,均质化并且被引导到样品,并且来自样品的光被光电检测器收集和检测。 两个源的光输出功率以相同的周期性和相反的幅度进行调制。 样品中物种浓度的变化影响表示来自两个光源的光功率之和的调制幅度,以产生输出信号。 该输出信号基于以基频周期性变化的电子分量提供在两个波长处的样本的传输(或其他光学性质)的差异的度量。 反馈方法,如零点检测,提供稳定,敏感的测量。 通过在不同频率调制不同的源对来实现在许多波长下同时测量所需的波分复用。
    • 5. 发明授权
    • Method and apparatus for measuring the intensity and phase of an
ultrashort light pulse
    • 用于测量超短光脉冲的强度和相位的方法和装置
    • US5754292A
    • 1998-05-19
    • US966644
    • 1992-10-26
    • Daniel J. KaneRick P. Trebino
    • Daniel J. KaneRick P. Trebino
    • G01J11/00G01B9/02
    • G01J11/00
    • The pulse shape I(t) and phase evolution x(t) of ultrashort light pulses are obtained using an instantaneously responding nonlinear optical medium to form a signal pulse. A light pulse, such a laser pulse, is split into a gate pulse and a probe pulse, where the gate pulse is delayed relative to the probe pulse. The gate pulse and the probe pulse are combined within an instantaneously responding optical medium to form a signal pulse functionally related to a temporal slice of the gate pulse corresponding to the time delay of the probe pulse. The signal pulse is then input to a wavelength-selective device to output pulse field information comprising intensity vs. frequency for a first value of the time delay. The time delay is varied over a range of values effective to yield an intensity plot of signal intensity vs. wavelength and delay. In one embodiment, the beams are overlapped at an angle so that a selected range of delay times is within the intersection to produce a simultaneous output over the time delays of interest.
    • 使用瞬时响应的非线性光学介质获得超短脉冲的脉冲形状I(t)和相位演变x(t),以形成信号脉冲。 光脉冲(例如激光脉冲)被分成门脉冲和探针脉冲,其中门脉冲相对于探针脉冲被延迟。 门脉冲和探针脉冲在瞬时响应的光学介质中组合以形成与对应于探针脉冲的时间延迟的门脉冲的时间片段功能相关的信号脉冲。 然后将信号脉冲输入到波长选择装置,以输出包括时间延迟的第一值的强度对频率的脉冲场信息。 时间延迟在有效产生信号强度对波长和延迟的强度图的值的范围内变化。 在一个实施例中,光束以一定角度重叠,使得延迟时间的选定范围在交叉点内,以产生在感兴趣的时间延迟上的同时输出。