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公开(公告)号：US20240322519A1
公开(公告)日：2024-09-26
申请号：US18598944
申请日：2024-03-07
IPC分类号： H01S5/042 , G01S17/894 , H01S5/0683
CPC分类号： H01S5/0428 , G01S17/894 , H01S5/0683
摘要： The present disclosure provides an improved indirect time-of-flight (iToF) system. The iToF system includes an imager and a laser driver system. The laser driver system receives an analog laser control signal from the imager, generating an analog laser driver current based on the analog laser control signal. The analog laser driver current is generated such that any change in an amplitude of the analog laser control signal causes a change in an amplitude of the analog laser drive current. Further, the present disclosure provides improved imagers and laser driver systems for use in an indirect time-of-flight system. An indirect time-of-flight system including a high-side multiplicative push-pull current mirror is also provided.
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公开(公告)号：US20240319373A1
公开(公告)日：2024-09-26
申请号：US18186802
申请日：2023-03-20
IPC分类号： G01S17/894 , G01S7/481 , G01S7/4915
CPC分类号： G01S17/894 , G01S7/4814 , G01S7/4816 , G01S7/4915
摘要： There is provided a continuous wave time of flight, CW-ToF, camera system comprising: a laser for emitting laser light; an imaging sensor, the image sensor comprising a pixel array for accumulating charge based on incident light comprising reflected laser light off an object, the pixel array comprising a plurality of rows of pixels; and a control system coupled to the imaging sensor and configured to control the pixel array to: reset at least a first row and a second row of the plurality of rows, wherein the first row and the second row are adjacent one another in the pixel array; accumulate charge in the pixels of the pixel array using a first integration setting for a first time period; reset the first row of the plurality of rows; accumulate charge in the pixels of the pixel array using the first integration setting or a second integration setting for a second time period subsequent to the first time period; read out a set of charge samples, wherein the first row contains a first charge from accumulating after the second time period and the second row contains a second charge from accumulating after the first and second time periods; and use the set of charge samples to approximate a charge from sampling after the first time period.
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公开(公告)号：US20240120725A1
公开(公告)日：2024-04-11
申请号：US17938620
申请日：2022-10-06
IPC分类号： H02H1/00 , G01R21/133 , G01R31/52
CPC分类号： H02H1/0015 , G01R21/133 , G01R31/52 , H02H1/0092
摘要： A measurement system includes an arc-fault detection circuit and a second detection circuit coupled to a current transducer. By providing both arc-fault detection and further detection capabilities using a current transducer, the overall circuit size may be reduced. To allow the arc-fault detection circuit and the second detection circuit to provide detection of different events, the circuits may operate at different sampling frequencies.
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公开(公告)号：US20230117191A1
公开(公告)日：2023-04-20
申请号：US17906238
申请日：2021-03-12
发明人： Erik D. Barnes , Junhua Shen , Alberto Marinas , Jonathan Ephraim David Hurwitz , Sivanendra Selvanayagam
摘要： Monitoring temperature of a laser diode and adjusting usage of the laser diode based on the monitoring information. The method of monitoring includes using a laser driver circuit to drive the laser diode to deliver multiple test current stimuli at different times related to the laser driver issuing one or a burst of illumination pulses. A differential measurement can be made between at least two of the test current stimuli. The differential measurement can be used to determine an indication of the heating or health of the laser diode in the system or of the laser system as a whole.
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公开(公告)号：US11272157B2
公开(公告)日：2022-03-08
申请号：US16742902
申请日：2020-01-14
IPC分类号： H04N13/128 , H04N13/254 , G01S7/4863 , G01S17/894 , G01S17/10 , G01S17/32 , H04N5/225 , H04N5/232 , G01S7/4915 , H04N13/00
摘要： An image processing system for time-of-flight depth imaging includes a processor for determining depth measurements using different modes of operation. The processor determines depth measurements in a first set of frames using a second set of frames. The first mode is a continuous wave modulation mode without depth linearization and the second mode is a continuous wave modulation mode with depth linearization. The depth estimates collected in the second mode using depth linearization are used to correct the depth estimates collected in the first mode.
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公开(公告)号：US20220029383A1
公开(公告)日：2022-01-27
申请号：US17358931
申请日：2021-06-25
IPC分类号： H01S5/068
摘要： The present disclosure relates to light source driving systems, for example laser driving systems. The systems are configured to include a very low inductance current loop for driving an initial part of the current drive signal to turn on the light source. By implementing the system to have a very low inductance current loop, a very fast turn on time may be achieved for the light source, which can be particularly useful for Time of Flight systems that require a very quick turn-on response from the light source.
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公开(公告)号：US20210242660A1
公开(公告)日：2021-08-05
申请号：US16780761
申请日：2020-02-03
IPC分类号： H01S5/042 , H01S5/183 , G01S17/894 , G01S7/4865 , H01S5/00 , G01S7/484
摘要： Time-of-flight (ToF) systems which use pulsed laser diodes, are required to measure distances with high level of precision and control. The present disclosure provides a method and a corresponding system for controlling a temporal response of a laser diode, in particular pulsed laser diodes. In particular, the present disclosure provides a method and a related system for driving a laser diode so as to obtain predominantly a peak pulse response while minimising or completely avoiding the post-peak response in a temporal response of the laser diode.
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公开(公告)号：US20210242659A1
公开(公告)日：2021-08-05
申请号：US16781652
申请日：2020-02-04
发明人： Jiannan Huang , Frank M. Yaul , Jonathan Ephraim David Hurwitz , Nicolas Le Dortz , Junhua Shen
IPC分类号： H01S5/042 , G01S7/4911
摘要： A laser emitter circuit comprises a laser diode; a driver circuit configured to generate a drive signal; and a resonant circuit coupled to the driver circuit and the laser diode, wherein the resonant circuit is configured to use the drive signal of the driver circuit to generate a continuous wave sinusoidal drive signal to drive the laser diode.
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9.发明申请公开(公告)号：US20200183434A1
公开(公告)日：2020-06-11
申请号：US16214275
申请日：2018-12-10
IPC分类号： G05F1/575
摘要： A technique for improving the stability of a voltage reference is provided. The implementation of technique is simple and elegant and does not involve a noise penalty. A compensation resistor is provided on one end of a string of resistors used to set a ΔVBE in a PTAT cell and to set a gain applied to the PTAT cell voltage.
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10.发明授权公开(公告)号：US10672577B2
公开(公告)日：2020-06-02
申请号：US15424487
申请日：2017-02-03
摘要： There is a need to monitor and control the state of relays and circuit breakers within power distribution systems. The monitoring of a relay state, i.e. open or closed, is often performed by applying a monitoring signal to sensing contacts added to the relay. Manufactures of such systems have chosen many different voltages for their own monitoring systems making it difficult to interconnect dissimilar monitoring systems. A signal conditioning circuit is provided that can cope with a large input voltage range and can be configured to allow may items of equipment (which may be new item or legacy items) to be connected to a controller.
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