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11.发明申请Efficient Implementation of Distance De-Aliasing for Ranging Systems using Phase Domain Computation 有权使用相域计算的测距系统的距离去锯齿的有效实现公开(公告)号：US20160216376A1
公开(公告)日：2016-07-28
申请号：US15009332
申请日：2016-01-28
Applicant: Texas Instruments Incorporated
Inventor： Bharath Patil
IPC: G01S17/10
CPC classification number: G01S17/36 , G01S7/4915 , G01S17/89
Abstract: A system and method for determining a distance to a surface of interest, such as in a Time of Flight (ToF) system, includes projecting modulated electromagnetic radiation of at least two frequencies to a point on the surface of interest, receiving the electromagnetic radiation reflected from the point on the surface of interest and demodulating the received electromagnetic radiation. Whereupon, a weighted phase difference between the frequencies may be calculated, in accordance with the present systems and methods, and one bin for each of the reflected frequencies for an actual distance to the point on the surface of interest is calculated using the weighted phase difference. A final phase of the bin for the actual distance is calculated as a weighted average of the phases of the bins based on the reflected signal strengths, and the actual distance to the point on the surface of interest is then output.
Abstract translation: 用于确定到目标表面的距离的系统和方法，例如在飞行时间（ToF）系统中，包括将至少两个频率的调制电磁辐射投射到感兴趣的表面上的点，接收反射的电磁辐射 从感兴趣的表面上的点解调所接收的电磁辐射。 因此，可以根据本系统和方法计算频率之间的加权相位差，并且使用加权相位差来计算与感兴趣的表面上的点的实际距离的每个反射频率的一个箱 。 基于反射信号强度计算实际距离的箱的最终相位作为箱的相位的加权平均值，然后输出到感兴趣的表面上的点的实际距离。
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公开(公告)号：US09323071B2
公开(公告)日：2016-04-26
申请号：US14486057
申请日：2014-09-15
Applicant: Texas Instruments Incorporated
Inventor： Bharath Patil , Karthik Rajagopal , Subhash Chandra Venkata Sadhu
CPC classification number: G02B27/48
Abstract: Laser speckle reduction using a passive diffuser. A diffuser for reducing laser speckle is disclosed comprising a diffuser having a colloid configured for placement in a light path of a coherent light source. The colloid exhibits Brownian motion. The diffuser can be formed of transparent plates containing the colloid. In a system for illumination, a coherent source of light outputting a light beam along a light path is provided; and a diffuser for reducing laser speckle effects is placed in the light path, the diffuser comprising a colloid disposed in a container that is transparent to the light beam output by the coherent source. A method includes illuminating a photosensitive sensor, comprising transmitting a coherent light from a light source through a diffuser comprising a colloid and directing the light from the diffuser onto the photosensitive sensor. Additional embodiments are disclosed.
Abstract translation: 使用无源漫射器进行激光散斑减光。 公开了一种用于减少激光散斑的漫射器，其包括具有配置用于放置在相干光源的光路中的胶体的扩散器。 胶体呈现布朗运动。 扩散器可以由含有胶体的透明板形成。 在照明系统中，提供沿光路输出光束的相干光源; 并且用于减少激光散斑效应的扩散器被放置在光路中，扩散器包括设置在由相干光源输出的光束透明的容器中的胶体。 一种方法包括照射光敏传感器，包括从光源通过包括胶体的扩散器传输相干光并将来自扩散器的光引导到感光传感器上。 公开了另外的实施例。
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13.发明授权公开(公告)号：US12276761B2
公开(公告)日：2025-04-15
申请号：US17077315
申请日：2020-10-22
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Subhash Chandra Venkata Sadhu , Bharath Patil , Jaiganesh Balakrishnan
IPC: G01S7/48 , G01S7/484 , G01S7/486 , G01S7/4865 , G01S7/4911 , G01S17/10 , G01S17/34 , G01S17/89 , G01S17/894
Abstract: A three dimensional time of flight (TOF) camera includes a transmitter and a receiver. The transmitter is configured to generate an electrical transmit signal at a plurality of frequencies over an integration time period and generate a transmit optical waveform corresponding with the electrical transmit signal. The receiver is configured to receive a reflected optical waveform that is the transmit optical waveform reflected off of an object, integrate the reflected optical waveform over the integration time period, and determine a distance to the target object based on a TOF of the optical waveform. The integration time period includes exposure time periods. A length of each of the exposure time periods corresponds to one of the frequencies. The TOF is determined based on a correlation of the electrical transmit signal and the return optical waveform utilizing a correlation function with respect to the integration time period.
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公开(公告)号：US11143552B2
公开(公告)日：2021-10-12
申请号：US14698978
申请日：2015-04-29
Applicant: Texas Instruments Incorporated
Inventor： Subhash Chandra Venkata Sadhu , Bharath Patil
Abstract: The disclosure provides a circuit to mitigate ripple. The circuit includes a controller that generates a PWM (pulse width modulated) clock signal. A DC/DC converter receives the PWM clock signal, and generates an output signal. A light source is coupled to the DC/DC converter, and receives the output signal. The light source transmits light pulses during an integration time. A time integral of the output signal during the integration time is constant during a plurality of quad time periods.
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公开(公告)号：US10935641B2
公开(公告)日：2021-03-02
申请号：US15796930
申请日：2017-10-30
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Subhash Chandra Venkata Sadhu , Bharath Patil
IPC: G01S7/4915 , G01S17/36 , G01S17/89
Abstract: A distance measurement system includes a light transmitter to generate a modulated light signal, a light sensor to generate measurement signals from reflected light among four quad phase angles with respect to a phase of the generated light signal, and a controller. The controller selects a first set of quad phase angles, and generates first measurement signals at the quad phase angles of the first set. Based on the first measurement signals, the controller computes a first phase angle between the generated light signal and the reflected light signal, generates a second set of quad phase angles based on the first phase angle, and generates second measurement signals at the quad phase angles of the second set. Further, based on the second measurement signals, the controller computes a second phase angle between the generated light signal and the reflected light signal and calculates a distance using the second phase angle.
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Patent Agency Ranking
公开(公告)号：US20200249331A1
公开(公告)日：2020-08-06
申请号：US16855287
申请日：2020-04-22
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Bharath Patil , Anjana Sharma , Subhash Chandra Venkata Sadhu , Ravishankar Ayyagari
Abstract: Systems and methods are provided for imaging a surface via time of flight measurement. An illumination system includes an illumination driver and an illumination source and is configured to project modulated electromagnetic radiation to a point on a surface of interest. A sensor system includes a sensor driver and is configured to receive and demodulate electromagnetic radiation reflected from the surface of interest. A temperature sensor is configured to provide a measured temperature representing a temperature at one of the illumination driver and the sensor driver and located at a position remote from the one of the illumination driver and the sensor driver. A compensation component is configured to calculate a phase offset between the illumination system and the sensor system from at least the measured temperature and a model representing transient heat flow within the system.
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公开(公告)号：US20160128160A1
公开(公告)日：2016-05-05
申请号：US14533763
申请日：2014-11-05
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Bharath Patil , Jagannathan Venkataraman
CPC classification number: H05B33/0815 , G09G2320/064 , H02M3/156 , H05B33/0818 , H05B33/0845 , H05B33/0851 , H05B37/02 , H05B41/3927 , Y02B20/346 , Y02B20/347 , Y10S362/80
Abstract: In an embodiment, method of controlling an illumination device by an output signal of a DC-DC converter is disclosed. The output signal is controlled by a PWM signal. The method includes receiving a feedback signal corresponding to variation in the output signal with respect to a pre-determined output signal, and determining a target duty cycle of the PWM signal based on the feedback signal. The PWM signal of the target duty cycle is capable of enabling the DC-DC converter to generate the pre-determined output signal. The method includes providing the PWM signal of an effective duty cycle equal to the target duty cycle over N switching pulses of the PWM signal to the DC-DC converter. The method provides the PWM signal by providing M switching pulses of a first PWM signal of a first duty cycle, and N−M switching pulses of a second PWM signal of a second duty cycle.
Abstract translation: 在一个实施例中，公开了通过DC-DC转换器的输出信号控制照明装置的方法。 输出信号由PWM信号控制。 该方法包括接收对应于输出信号相对于预定输出信号的变化的反馈信号，以及基于反馈信号确定PWM信号的目标占空比。 目标占空比的PWM信号能够使DC-DC转换器产生预定的输出信号。 该方法包括将PWM信号的N个开关脉冲的等效于目标占空比的有效占空比提供给DC-DC转换器。 该方法通过提供第一占空比的第一PWM信号的M个开关脉冲和第二占空比的第二PWM信号的N-M个开关脉冲来提供PWM信号。
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18.发明授权公开(公告)号：US11543523B2
公开(公告)日：2023-01-03
申请号：US16235667
申请日：2018-12-28
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Venkata Subhash Chandra Sadhu , Bharath Patil , Nithin Jose , Shubham Agrawal
Abstract: A time of flight (ToF) system includes a light source, a photosensor, a signal generator and a processor. The signal generator outputs a reference signal corresponding to a modulation function for modulated light and a modified transmitted light signal corresponding to a phase shift of the reference signal. The light source outputs the modified transmitted light signal and pixels in the photosensor receives its reflections off the scene. The reference signal is applied to the pixels and the processor determines a depth map for the scene based on values recorded by the pixels. In some examples, the phase shift is implemented using a phase locked loop controller. One or more component phases of the phase shift and an exposure time for each component phase are determined and output by the phase locked loop controller.
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公开(公告)号：US10663566B2
公开(公告)日：2020-05-26
申请号：US15729060
申请日：2017-10-10
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Bharath Patil , Anjana Sharma , Subhash Chandra Venkata Sadhu , Ravishankar Ayyagari
Abstract: Systems and methods are provided for imaging a surface via time of flight measurement. An illumination system includes an illumination driver and an illumination source and is configured to project modulated electromagnetic radiation to a point on a surface of interest. A sensor system includes a sensor driver and is configured to receive and demodulate electromagnetic radiation reflected from the surface of interest. A temperature sensor is configured to provide a measured temperature representing a temperature at one of the illumination driver and the sensor driver and located at a position remote from the one of the illumination driver and the sensor driver. A compensation component is configured to calculate a phase offset between the illumination system and the sensor system from at least the measured temperature and a model representing transient heat flow within the system.
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公开(公告)号：US20180031682A1
公开(公告)日：2018-02-01
申请号：US15729060
申请日：2017-10-10
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Bharath Patil , Anjana Sharma , Subhash Chandra Venkata Sadhu , Ravishankar Ayyagari
Abstract: Systems and methods are provided for imaging a surface via time of flight measurement. An illumination system includes an illumination driver and an illumination source and is configured to project modulated electromagnetic radiation to a point on a surface of interest. A sensor system includes a sensor driver and is configured to receive and demodulate electromagnetic radiation reflected from the surface of interest. A temperature sensor is configured to provide a measured temperature representing a temperature at one of the illumination driver and the sensor driver and located at a position remote from the one of the illumination driver and the sensor driver. A compensation component is configured to calculate a phase offset between the illumination system and the sensor system from at least the measured temperature and a model representing transient heat flow within the system.
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