公开(公告)号：US20230324219A1

公开(公告)日：2023-10-12

申请号：US17716585

申请日：2022-04-08

Applicant: VIAVI SOLUTIONS INC.

Inventor： Christopher Russell WAGNER

IPC: G01J1/44 ,  H03F3/45 ,  H03M1/12

CPC classification number: G01J1/44 ,  H03F3/45475 ,  H03M1/124 ,  G01J2001/4406 ,  G01J2001/446

Abstract: A system for amplification of optical signals for optical measurement instrumentation is disclosed. The system may include a first logarithmic amplifier circuit in a first amplification path, and a linear amplifier circuit and a second logarithmic amplifier circuit coupled in series in a second amplification path. The first and second amplification paths may receive an input signal from a photodiode and provide amplified signals, in parallel, to a selection circuit, which may select one of the outputs of the first and second amplification paths based on one or two power thresholds. The selection circuit may then provide the selected output to a measurement circuit or device. In some examples, the system may also include a sampling circuit to sample the outputs and an analog-digital conversion circuit to digitize the outputs before selection. The power threshold(s) may be determined based on a saturation level of the linear amplifier circuit.

公开(公告)号：US11781907B2

公开(公告)日：2023-10-10

申请号：US17340181

申请日：2021-06-07

Applicant: Fitbit, Inc.

Inventor： Sebastian Joseph Capella ,  Shelten Gee Jao Yuen ,  Subramaniam Venkatraman ,  Félix Antoine Turgeon ,  Heiko Gernot Albert Panther

IPC: G01J1/42 ,  A61B5/1455 ,  G09G5/10 ,  A61B5/00 ,  G01J1/32 ,  G01J1/18 ,  G01J1/44 ,  G01J1/46 ,  G01J1/02 ,  G01J1/04 ,  G06V10/141 ,  A61B5/024 ,  A61B5/021 ,  A61B5/145 ,  A61B5/0533 ,  A61B5/01 ,  G06V40/10

CPC classification number: G01J1/4204 ,  A61B5/1455 ,  A61B5/681 ,  A61B5/742 ,  G01J1/0204 ,  G01J1/0219 ,  G01J1/0271 ,  G01J1/0407 ,  G01J1/18 ,  G01J1/32 ,  G01J1/44 ,  G01J1/46 ,  G06V10/141 ,  G09G5/10 ,  A61B5/01 ,  A61B5/021 ,  A61B5/024 ,  A61B5/02405 ,  A61B5/0533 ,  A61B5/14532 ,  A61B5/489 ,  G01J2001/0257 ,  G01J2001/182 ,  G01J2001/444 ,  G01J2001/4406 ,  G06V40/15 ,  G09G2320/0626 ,  G09G2354/00 ,  G09G2360/144 ,  G09G2380/08

Abstract: A wearable computing device includes an electronic display with a configurable brightness level setting, a physiological metric sensor system including a light source configured to direct light into tissue of a user wearing the wearable computing device and a light detector configured to detect light from the light source that reflects back from the user. The device may further include control circuitry configured to activate the light source during a first period, generate a first light detector signal indicating a first amount of light detected by the light detector during the first period, deactivate the light source during a second period, generate a second light detector signal indicating a second amount of light detected by the light detector during the second period, generate a physiological metric based at least in part on the first light detector signal and the second light detector signal, and modify the configurable brightness level setting based on the second light detector signal.

公开(公告)号：US20180335343A1

公开(公告)日：2018-11-22

申请号：US16028293

申请日：2018-07-05

Applicant: PsiQuantum Corp

Inventor： Faraz Najafi ,  Syrus ZIAI

IPC: G01J1/44

CPC classification number: G01J1/44 ,  G01J1/0407 ,  G01J1/42 ,  G01J2001/4406 ,  G01J2001/442 ,  G01J2001/4446

Abstract: The various embodiments described herein include methods, devices, and systems for fabricating and operating photodetector circuitry. In one aspect, a photon detector system includes: (1) a first superconducting wire having a first threshold superconducting current; (2) a second superconducting wire having a second threshold superconducting current; (3) a resistor coupled to the first wire and the second wire; (4) current source(s) coupled to the first wire and configured to supply a current that is below the second threshold current; and (3) a second circuit coupled to the second wire. In response to receiving light at the first wire, the first wire transitions from a superconducting state to a non-superconducting state. In response to receiving light at the second wire while the first wire is in the non-superconducting state, the second wire transitions to a non-superconducting state, redirecting the first current to the second circuit.

公开(公告)号：US20180073921A1

公开(公告)日：2018-03-15

申请号：US15394659

申请日：2016-12-29

Applicant: HISENSE BROADBAND MULTIMEDIA TECHNOLOGIES, CO. LTD. ,  HISENSE BROADBAND MULTIMEDIA TECHNOLOGIES, LTD.

Inventor： QIANG ZHANG ,  QISHENG ZHAO

IPC: G01J1/44 ,  H01L31/103 ,  H01L31/107 ,  G02B6/42

CPC classification number: G01J1/44 ,  G01J2001/4406 ,  G01J2001/446 ,  G02B6/4274 ,  G02B6/4293 ,  H01L31/103 ,  H01L31/107 ,  H04B10/6911

Abstract: The present disclosure provides an optical module comprising: a photoelectric conversion unit, a first demodulation circuit, and a second demodulation circuit; the first demodulation circuit and the second demodulation circuit are respectively connected to the photoelectric conversion unit; the photoelectric conversion unit is configured to convert the received optical signal into an electrical signal; the first demodulation circuit is configured to demodulate an electrical signal converted by the photoelectric conversion unit and generate a high-frequency electrical signal; the second demodulation circuit is configured to demodulate an electrical signal converted by the photoelectric conversion unit and generate a low-frequency electrical signal.

公开(公告)号：US20180019825A1

公开(公告)日：2018-01-18

申请号：US15538075

申请日：2015-02-23

Applicant: Mitsubishi Electric Corporation

Inventor： Satoshi SHIRAI ,  Masaki NODA

IPC: H04B10/69 ,  G01J1/44

CPC classification number: H04B10/6911 ,  G01J1/44 ,  G01J2001/4406 ,  G01J2001/4466 ,  H01J40/14 ,  H03G3/20 ,  H03G3/3084 ,  H04B10/152 ,  H04B10/40 ,  H04B10/69

Abstract: A light receiving device that receives a light signal includes: a plurality of avalanche photodiodes, in each of which receiving sensitivity is set in accordance with a bias signal that is provided; a plurality of level conversion units provided in association with the avalanche photodiodes, each of the level conversion units being configured to convert a level of a reference voltage for obtaining the bias signal so as to generate the bias signal and being configured to provide the bias signal to corresponding one of the avalanche photodiodes; and a control unit that generates a first control signal corresponding to a temperature of the light receiving device, and controls a level conversion amount of each of the level conversion units by using the first control signal.

公开(公告)号：US09746374B2

公开(公告)日：2017-08-29

申请号：US14424442

申请日：2014-02-26

Applicant: Otsuka Electronics Co., Ltd.

Inventor： Hisashi Shiraiwa

IPC: G01J3/02 ,  G01J3/42 ,  G01J3/28 ,  G01J1/44

CPC classification number: G01J3/0264 ,  G01J1/44 ,  G01J3/02 ,  G01J3/0232 ,  G01J3/0262 ,  G01J3/2803 ,  G01J3/42 ,  G01J2001/4406 ,  G01J2001/444 ,  G01J2001/448

Abstract: A spectrophotometer includes a photodetection unit configured to convert received light into an electric signal to output the electric signal; a circuit unit including a plurality of gain amplifiers and a plurality of AD converters configured to amplify an output signal from the photodetection unit by a plurality of gains using the plurality of gain amplifiers and configured to convert the amplified output signals into digital signals using the plurality of AD converters to output the digital signals as a plurality of pieces of light amount data; a saturation determination unit configured to determine whether or not each of the plurality of pieces of light amount data from the circuit unit has been saturated; and a measurement result calculation unit configured to calculate, in accordance with a result of the determination by the saturation determination unit, a measurement result of the received light using a part or all of the plurality of pieces of light amount data.

公开(公告)号：US20170203387A1

公开(公告)日：2017-07-20

申请号：US15403284

申请日：2017-01-11

Applicant: MTU Aero Engines AG

Inventor： Alexander LADEWIG ,  Andreas JAKIMOV ,  Katrin FRIEDBERGER

IPC: B23K26/03 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y50/02 ,  G01N21/88 ,  B23K26/342 ,  B23K15/00 ,  B23K15/02 ,  G01J1/44 ,  B28B1/00 ,  B33Y80/00

CPC classification number: B23K26/032 ,  B22F3/1055 ,  B22F5/04 ,  B22F2003/1056 ,  B22F2003/1057 ,  B22F2999/00 ,  B23K15/0086 ,  B23K15/02 ,  B23K26/342 ,  B23K2101/001 ,  B28B1/001 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y50/02 ,  B33Y80/00 ,  C04B35/111 ,  C04B2235/6026 ,  F01D25/005 ,  F05D2220/323 ,  F05D2230/31 ,  G01J1/44 ,  G01J2001/4406 ,  G01N21/31 ,  G01N21/4738 ,  G01N21/71 ,  G01N21/8806 ,  G01N2021/4769 ,  Y02P10/295 ,  B22F2203/00 ,  B22F2207/00

Abstract: A method for ascertaining the concentration of at least one material in a powder mixture used as starting material for the production of a component in an additive production method, comprising: providing the powder mixture having at least two different materials; guiding a high-energy beam generated by a radiation source over the surface of the powder mixture; detecting by a detection unit at least one brightness value of at least one subregion of the surface irradiated by the high-energy beam during the irradiation; ascertaining by an analysis unit the concentration of at least one material in the powder mixture depending on the detected at least one brightness value and at least one predetermined reference brightness value for a concentration and/or a concentration range of the material.

公开(公告)号：US20170167915A1

公开(公告)日：2017-06-15

申请号：US15334200

申请日：2016-10-25

Applicant: SHENYANG NEUSOFT MEDICAL SYSTEMS CO., LTD.

Inventor： Jian Zhao ,  Nan Li ,  Guocheng Wu ,  Baowei Xu ,  Changqing Fu ,  Guodong Liang

IPC: G01J1/44

CPC classification number: G01J1/44 ,  G01J2001/4406 ,  G01J2001/4453 ,  H01J43/30

Abstract: A method of adjusting a gain of a detector is provided in the present disclosure. According to an example, whether a gain of a photomultiplier tube in the detector meets a gain determination condition may be determined, where the gain determination condition may indicate that an absolute of a difference between the gain of the photomultiplier tube and a target gain is within a predetermined numerical range. When the gain of the photomultiplier tube does not meet the gain determination condition, a voltage of the photomultiplier tube may be adjusted, such that the gain of the photomultiplier tube meets the gain determination condition.

公开(公告)号：US09562808B2

公开(公告)日：2017-02-07

申请号：US14634245

申请日：2015-02-27

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Masayuki Sugizaki ,  Shigeyuki Sakura ,  Toyoaki Uo

IPC: H01J40/14 ,  G01J1/44 ,  H04B10/80 ,  H03F1/08 ,  H03F1/22 ,  H03F3/08

CPC classification number: G01J1/44 ,  G01J2001/4406 ,  G01J2001/446 ,  H03F1/086 ,  H03F1/223 ,  H03F3/082 ,  H04B10/6931 ,  H04B10/802

Abstract: A light receiving circuit includes a light receiving element, a first transistor that includes a control terminal which is connected to the light receiving element through a first node, a first terminal and a second terminal, a first load circuit that is connected between a power supply potential and a second node connected to the second terminal, and outputs a voltage signal to a third node, wherein the voltage signal is based on a current signal in the light receiving element, a first feedback resistor that is connected between the first node and the third node, a first limiter circuit that is connected in parallel with the first feedback resistor, and limits an increase of voltage at both ends of the first feedback resistor, and a first circuit that is connected between the second node and the reference potential, includes a second transistor which is diode-connected.

Abstract translation: 光接收电路包括光接收元件，第一晶体管，其包括通过第一节点连接到光接收元件的控制端子，第一端子和第二端子，第一负载电路，连接在电源 电位和第二节点连接到第二终端，并且将电压信号输出到第三节点，其中电压信号基于光接收元件中的电流信号，第一反馈电阻器连接在第一节点和第二节点之间， 第三节点，与第一反馈电阻并联连接的第一限幅器电路，并且限制第一反馈电阻器两端的电压增加，以及连接在第二节点和参考电位之间的第一电路包括 二极管连接的第二晶体管。

公开(公告)号：US20160178442A1

公开(公告)日：2016-06-23

申请号：US14757702

申请日：2015-12-23

Applicant: Advanced Energy Industries, Inc.

Inventor： Donald F. Murray

IPC: G01J5/10

CPC classification number: G01J5/24 ,  G01J1/44 ,  G01J2001/4406 ,  G01J2001/446

Abstract: This disclosure describes systems, methods, and apparatus for improving the signal-to-noise ratio, increasing sampling speed, and increasing the dynamic range of a pyrometer via improvements to the amplification section. In particular, single-stage non-differentiated amplifiers can be replaced with a differential amplifier circuit that increases gain without a proportional increase in noise. The differential amplifier circuit can comprise a pair of transimpedance amplifier circuits arranged in parallel that receive a differential current from a photo detector and generate a differential voltage output in response having a transconductance gain.

Abstract translation: 本公开描述了通过对放大部分的改进来改善信噪比，提高采样速度以及增加高温计的动态范围的系统，方法和装置。 特别地，单级非微分放大器可以用增加增益而不增加噪声的差分放大器电路代替。 差分放大器电路可以包括一对并联布置的跨阻抗放大器电路，其接收来自光电检测器的差分电流，并产生具有跨导增益的响应的差分电压输出。