公开(公告)号：US09048785B2

公开(公告)日：2015-06-02

申请号：US14077458

申请日：2013-11-12

Applicant: NATIONAL CHIAO TUNG UNIVERSITY

Inventor： Hao-Chiao Hong ,  Yun-Tse Chen ,  Shao-Feng Hung

IPC: H03D3/00 ,  H03D7/16 ,  G01J9/02 ,  G01J9/04

CPC classification number: H03D3/00 ,  G01J9/02 ,  G01J9/04 ,  H03D3/04 ,  H03D7/161 ,  H03D2200/0021 ,  H03D2200/0049

Abstract: A periodically resetting integration angle demodulation device and a method using the same is disclosed, which uses a waveform multiplier and a periodically resetting integrator to modulate a continuous-time angle modulation signal into a discrete-time signal. The waveform multiplier multiplies the continuous-time angle modulation signal by a square wave signal whose frequency is integer times a carrier frequency, and then transmits the continuous-time angle modulation signal to a periodically resetting integrated circuit. The periodically resetting integrated circuit performs integration during a carrier period to generate a discrete-time angle modulation output signal. The present invention can greatly reduce the difficulty for designing an optical sensing system in the front end without limiting a modulation depth. Besides, the present invention achieves a small volume, high speed, high sensitivity, high reliability, high performance and high condition-adapting properties.

Abstract translation: 公开了周期性复位积分角解调装置及其使用方法，其使用波形乘法器和周期性复位积分器将连续时间角调制信号调制成离散时间信号。 波形乘法器将连续时间角调制信号乘以频率为载波频率的整数倍的方波信号，然后将连续时间角调制信号发送到周期性复位集成电路。 周期复位集成电路在载波周期期间执行积分以产生离散时间角调制输出信号。 本发明可以大大降低在前端设计光学感测系统的难度，而不会限制调制深度。 此外，本发明实现了小体积，高速度，高灵敏度，高可靠性，高性能和高条件适应性能。

公开(公告)号：US20110170104A1

公开(公告)日：2011-07-14

申请号：US12529899

申请日：2008-03-04

Applicant: Christophe Gosset ,  Jérémie Renaudier ,  Jean-Louis Oudar ,  Guy Georgea Aubin

Inventor： Christophe Gosset ,  Jérémie Renaudier ,  Jean-Louis Oudar ,  Guy Georgea Aubin

IPC: G01J9/04

CPC classification number: G01J9/04

Abstract: The invention relates to a self-referenced device (1) for measuring the spectral phase of a periodic signal having a frequency fp, the periodic signal being carried by an optical signal, comprising: a phase shifting means (4); a transmission means (3) for transmitting at least three optical modes of said periodic signal to the phase shifting means, said optical modes defining beats at the fp frequency; the phase shifting means (4) being capable of modifying the phase difference between the beats at the fp frequency; characterised in that the measuring means (6, 7, 8) include: photoelectric conversion means (6) for detecting the variable term at the fp frequency of the optical signal received power in order to generate an electric signal (14) corresponding to the superimposition of the optical beats at the fp frequency; electric measuring means (7, 8) for measuring the amplitude of the electric signal in order to determine the amplitude of the beats at the fp frequency.

Abstract translation: 本发明涉及一种用于测量具有频率fp的周期信号的频谱相位的自参考装置（1），该周期信号由光信号承载，包括：相移装置（4）; 用于将所述周期信号的至少三种光模式发射到相移装置的传输装置（3），所述光模式以fp频率定义节拍; 相位移动装置（4）能够以fp频率修改节拍之间的相位差; 其特征在于，测量装置（6,7,8）包括：光电转换装置（6），用于检测光信号接收功率的fp频率处的可变项，以便产生对应于叠加的电信号（14） 的光学节拍在fp频率; 电测量装置（7,8），用于测量电信号的振幅，以便确定在fp频率下的节拍幅度。

公开(公告)号：US06970250B1

公开(公告)日：2005-11-29

申请号：US09488149

申请日：2000-01-20

Applicant: Wayne V. Sorin ,  Douglas M. Baney

Inventor： Wayne V. Sorin ,  Douglas M. Baney

IPC: G01J9/04 ,  H04B10/04 ,  H04B10/06 ,  H04B10/08 ,  H04B10/142 ,  H04B10/148 ,  H04B10/152 ,  H04B17/00 ,  G01B9/02

CPC classification number: H04B10/60 ,  H04B10/64

Abstract: Monitoring an optical signal utilizing optical heterodyne detection involves attenuating an input signal before the input signal is combined with a local oscillator signal. The input signal is attenuated in order improve the signal to noise ratio of the heterodyne signal that is generated when the input signal and the local oscillator signal are combined. The signal to noise ratio of the heterodyne signal improves with attenuation of the input signal, specifically in the case where the intensity noise from the input signal is the dominant noise source, because the heterodyne signal and the intensity noise of the input signal scale differently with attenuation of the input signal.

Abstract translation: 利用光外差检测来监测光信号涉及在将输入信号与本地振荡器信号组合之前衰减输入信号。 输入信号衰减，以提高当输入信号和本地振荡器信号组合时产生的外差信号的信噪比。 外差信号的信噪比随着输入信号的衰减而改善，特别是在输入信号的强度噪声是主要噪声源的情况下，因为外差信号和输入信号的强度噪声与 输入信号衰减。

公开(公告)号：US06853456B2

公开(公告)日：2005-02-08

申请号：US10062604

申请日：2002-01-31

Applicant: Bradley Mells

Inventor： Bradley Mells

IPC: G01J9/04 ,  G01B9/02

CPC classification number: G01J9/04

Abstract: A method and apparatus are provided for detecting a frequency of an optical signal within a communications channel having a plurality of optical carriers separated by a predetermined frequency spacing. The method includes the steps of locking an optical carrier frequency to an axial mode of an optical resonator of known free spectral range; providing an additional optical resonator as a reference having a known free spectral range that differs from that of the first optical resonator; locking an optical reference signal to a closest axial mode of a reference optical resonator producing an optical reference signal that is spectrally offset from said optical carrier frequency by a spectral quantity less than the known free spectral range; mixing the optical carrier frequency with the reference optical signal frequency thus generating a difference signal as a beat frequency; and measuring a frequency of a difference signal.

Abstract translation: 提供一种方法和装置，用于检测具有以预定频率间隔隔开的多个光载波的通信信道内的光信号的频率。 该方法包括将光载波频率锁定到已知自由光谱范围的光学谐振器的轴向模式的步骤; 提供附加的光学谐振器作为具有与第一光学谐振器不同的已知自由光谱范围的参考; 将光学参考信号锁定到参考光学谐振器的最接近的轴向模式，产生光学参考信号，所述光学参考信号与所述光学载波频率频谱偏移小于已知的自由光谱范围的光谱量; 将光载波频率与参考光信号频率混合，从而产生差分信号作为拍频; 并测量差分信号的频率。

公开(公告)号：US20050012934A1

公开(公告)日：2005-01-20

申请号：US10623403

申请日：2003-07-18

Applicant: Bogdan Szafraniec

Inventor： Bogdan Szafraniec

IPC: G01J9/00 ,  G01J9/04 ,  H04B10/02 ,  H04B10/08 ,  G01B9/02

CPC classification number: G01J9/04 ,  H04B10/0795

Abstract: An optical analyzer and method for measuring optical properties of optical signals utilizes a heterodyne architecture to measure spectral amplitude and phase of a periodically modulated input optical signal, such as an optical signal from a periodically modulated distributed feedback (DFB) laser. The spectral amplitude and phase measurements are derived from a heterodyne signal, which is produced by combining and mixing the input optical signal and a local oscillator (LO) signal. The optical spectrum that is reconstructed from the heterodyne signal includes “inner” spectral peaks that contain phase information of the input optical signal. The inner spectral peaks may be produced by an optical or electrical mixing technique. The spectral phase of the input optical signal is recovered from the inner spectral peaks of the reconstructed optical spectrum.

Abstract translation: 用于测量光信号的光学特性的光学分析仪和方法利用外差架构来测量周期性调制的输入光信号（例如来自周期性调制分布反馈（DFB）激光器的光信号）的频谱幅度和相位。 通过组合和混合输入光信号和本地振荡器（LO）信号产生的外差信号导出频谱幅度和相位测量。 从外差信号重构的光谱包括包含输入光信号的相位信息的“内”谱峰。 内部光谱峰可以通过光学或电气混合技术产生。 从重构光谱的内部光谱峰恢复输入光信号的光谱相位。

公开(公告)号：US5493395A

公开(公告)日：1996-02-20

申请号：US436598

申请日：1995-05-08

Applicant: Masaru Otsuka

Inventor： Masaru Otsuka

IPC: G01B9/02 ,  G01J9/02 ,  G01J9/04 ,  H01S3/131

CPC classification number: G01J9/0246 ,  G01J2009/0207 ,  G01J9/04

Abstract: A wavelength variation measuring apparatus is disclosed. A light beam from a light source device capable of controlling an oscillation wavelength is divided into two light beams by a light divider. A predetermined optical path length difference is imparted to the divided light beams to synthesize the beams by a light synthesizer. A part of the synthesized light is used as detection light and the rest of the synthesized light is used as measuring light. A beat signal is detected from the detection light by a photodetector. A feedback control is effected to the light source device by use of the beat signal to thereby stabilize the oscillated wavelength of the light source device and to direct the measuring light to an object to be measured. The beat signal is rendered as a measurement data correction signal, and measurement data obtained by directing the measuring light to the object to be measured is corrected.

Abstract translation: 公开了一种波长变化测量装置。 来自能够控制振荡波长的光源装置的光束被分光器分成两束光束。 通过光合成器对划分的光束赋予预定的光程长度差以合成光束。 合成光的一部分用作检测光，其余的合成光用作测量光。 通过光检测器从检测光检测拍频信号。 通过使用拍频信号对光源装置进行反馈控制，从而稳定光源装置的振荡波长并将测量光引导到待测物体。 将拍频信号作为测量数据校正信号，并且通过将测量光指向待测量对象而获得的测量数据被校正。

公开(公告)号：US5345306A

公开(公告)日：1994-09-06

申请号：US704142

申请日：1991-05-22

Applicant: Tsutomu Ichimura ,  Fumio Inaba

Inventor： Tsutomu Ichimura ,  Fumio Inaba

IPC: G01J9/04 ,  G01N21/17 ,  G01N21/39 ,  G01N21/45 ,  G01N21/47 ,  G02B21/00 ,  G01B9/02

CPC classification number: G01N21/4795 ,  G01N21/17 ,  G02B21/002 ,  G01N2021/1742 ,  G01N2021/451 ,  G01N2021/4707 ,  G01N2021/4709 ,  G01N21/39

Abstract: In the method of and apparatus for measuring a spectral absorption in an opaque specimen, a scattering specimen is illuminated with highly directional light of variable wavelength from a specific direction, thereby removing scattered rays as much as possible, and thus detecting the intensity of only parallel rays of a component transmitted or reflected in a specific direction (i.e., rectilinear component rays) by use of a highly directional detecting system, for example, a heterodyne light-receiving system, Michelson light-receiving system, highly directional optical system, etc. It is therefore possible to measure spectral absorption characteristics of a scattering specimen with high accuracy without picking up scattered light in other undesired directions nor other noise light. In addition, the measurement of the control is exceedingly simplified in comparison to the conventional method and thus the measurement is extremely facilitated. Thus, the method and apparatus of the present invention are suitable for measuring spectral absorption of a component transmitted or reflected in a specific direction in not only sparse heterogeneous systems having spatial resolving power, for example, suspensions, organic tissues, etc., but also dense translucent objects.

Abstract translation: 在不透明样品中的光谱吸收测定方法和测定装置中，以特定方向的可变波长的高度定向的光照射散射试样，从而尽可能地除去散射的光线，从而检测出只有平行的强度 通过使用高度定向的检测系统，例如外差光接收系统，迈克尔逊光接收系统，高度定向光学系统等，在特定方向（即，直线分量射线）上发射或反射的分量的光线。 因此，可以高精度地测量散射试样的光谱吸收特性，而不会在其它不需要的方向上拾取散射光，也不会检测其他噪声光。 此外，与常规方法相比，控制的测量被非常简化，因此极大的方便了测量。 因此，本发明的方法和装置不仅适用于不仅具有空间分辨能力的稀疏异质系统，例如悬浮液，有机组织等，而是在特定方向上传输或反射的组分的光谱吸收， 密实的半透明物体。

公开(公告)号：US5122974A

公开(公告)日：1992-06-16

申请号：US578063

申请日：1990-09-05

Applicant: Britton Chance

Inventor： Britton Chance

IPC: A61B5/00 ,  G01J9/04 ,  G01N21/49

CPC classification number: A61B5/1455 ,  A61B5/14553 ,  G01N21/49 ,  G01J9/04 ,  G01N2021/1791 ,  G01N2201/06113

Abstract: The present invention to provides methods and apparatus for studying photon migration using signal modulation techniques such as time, frequency and phase modulation. The photon migration data may then be converted, using the principles of time-resolved spectroscopy, to determine the concentration of an absorptive constituent in a scattering medium, such as the concentration of hemoglobin in a brain of other tissue. The methods and apparatus disclosed provide as a specific embodiment, a dual wavelength phase modulation system which allows the clinical application of the advantages of time resolved spectroscopy in an economical and commercially feasible embodiment.

Abstract translation: 本发明提供了使用诸如时间，频率和相位调制之类的信号调制技术研究光子迁移的方法和装置。 然后可以使用时间分辨光谱学的原理转换光子迁移数据，以确定散射介质中的吸收成分的浓度，例如其他组织脑中血红蛋白的浓度。 所公开的方法和装置作为具体实施方案提供了双波长相位调制系统，其允许在经济和商业上可行的实施方案中临时应用时间分辨光谱的优点。

公开(公告)号：US5032714A

公开(公告)日：1991-07-16

申请号：US460009

申请日：1990-01-02

Applicant: Akira Takahashi ,  Musubu Koishi

Inventor： Akira Takahashi ,  Musubu Koishi

IPC: G01J9/04 ,  G01J11/00 ,  G01N21/64

CPC classification number: G01J11/00 ,  G01N21/6408 ,  G01J2011/005 ,  G01J9/04

Abstract: Laser sources produce two light beams which are different in frequency and at least one of which is a pulse beam. The two light beams are subjected to sum frequency mixing in a non-linear optical element and a resultant sum frequency beam is applied to a specimen as an exciting pulse beam. A pulse beam separated from the sum frequency beam and synchronized therewith is detected by a photodetector. A measuring means measures a waveform of fluorescence light emitted from the specimen using an output of the photodetector as a measurement starting reference signal. According to one embodiment, the device operates in a single photon counting mode and the measuring means counts repeatedly an elapsed time from the detection of the measurement start reference signal to the detection of the fluorescence light for every divided section of the elapsed time.

Abstract translation: 激光源产生频率不同的两个光束，其中至少一个是脉冲光束。 将两个光束在非线性光学元件中进行和频混合，并将所得到的和频波束作为激发脉冲光束施加到样本。 由和频波束分离并与其同步的脉冲光束由光电检测器检测。 测量装置使用光电检测器的输出作为测量开始参考信号来测量从样本发射的荧光的波形。 根据一个实施例，设备以单光子计数模式工作，并且测量装置重复计算从测量开始参考信号的检测到对经过时间的每个分割部分的荧光检测的经过时间。

公开(公告)号：US4997273A

公开(公告)日：1991-03-05

申请号：US400255

申请日：1989-08-29

Applicant: Donald A. Leonard ,  Harold E. Sweeney

Inventor： Donald A. Leonard ,  Harold E. Sweeney

IPC: G01J5/00 ,  G01J9/04 ,  G01N21/63

CPC classification number: G01J5/08 ,  G01J5/00 ,  G01J5/0037 ,  G01J5/007 ,  G01J5/0896 ,  G01J2005/583 ,  G01J3/4412 ,  G01J9/04 ,  G01N2021/1793 ,  G01N2021/638

Abstract: A technique for measuring the unknown subsurface temperature T.sub.s of a bulk transparent medium such as ocean water by generating a continuous (cw) laser beam and pulsed laser beam both having the same wavelength, with the intensity of the pulsed laser beam exceeding the intensity required to produce stimulated Brillouin scattering in the water. By directing the pulsed laser beam into the water, it causes a return phase-conjugate beam to emanate therefrom. The return phase-conjugate beam and the pulsed laser beam are separated, and the phase-conjugate beam and the cw beam are mixed together thereby producing a heterodyne frequency proportional to the temperature T.sub.s. By converting the heterodyne frequency into a temperature value, yields the desired unknown T.sub.s.

Abstract translation: 通过产生具有相同波长的连续（cw）激光束和脉冲激光束来测量大体透明介质如海洋水的未知地下温度Ts的技术，其中脉冲激光束的强度超过了所需的强度 在水中产生刺激的布里渊散射。 通过将脉冲激光束引导到水中，其导致返回相位共轭光束从其发射。 将返回相位共轭光束和脉冲激光束分离，将相位共轭光束和cw光束混合在一起，从而产生与温度Ts成比例的外差频率。 通过将外差频率转换为温度值，产生所需的未知Ts。