公开(公告)号：US20180031676A1

公开(公告)日：2018-02-01

申请号：US15662352

申请日：2017-07-28

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Subhash Chandra Venkata SADHU

IPC: G01S7/484 ,  G01S17/10 ,  G01S17/89 ,  G01S7/486

CPC classification number: G01S7/484 ,  G01S7/4865 ,  G01S17/10 ,  G01S17/89 ,  G01S17/936

Abstract: An optical transmitting system for distance measuring includes a modulation signal generator, a light source, and an illumination driver coupled to the modulation signal generator and the light source. The modulation signal generator is configured to generate a modulation signal. The light source is configured to generate an optical waveform with amplitude modulation corresponding with the modulation signal. The illumination driver is configured to drive the light source. The illumination driver includes a switch and a switch driver. The switch is configured to switch between an on state and an off state to drive the light source. The switch driver is configured to drive the switch between the on and off states. The switch driver includes a first inductor and a capacitor in series with the first inductor and the switch.

公开(公告)号：US20210041541A1

公开(公告)日：2021-02-11

申请号：US17077315

申请日：2020-10-22

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Subhash Chandra Venkata SADHU ,  Bharath PATIL ,  Jaiganesh BALAKRISHNAN

IPC: G01S7/4865 ,  G01S17/89 ,  G01S7/484 ,  G01S7/486 ,  G01S17/10 ,  G01S7/4911 ,  G01S17/34

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.

公开(公告)号：US20190129017A1

公开(公告)日：2019-05-02

申请号：US15796930

申请日：2017-10-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Subhash Chandra Venkata SADHU ,  Bharath PATIL

IPC: G01S7/491 ,  G01S17/36

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.

公开(公告)号：US20210181323A1

公开(公告)日：2021-06-17

申请号：US17163601

申请日：2021-02-01

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Subhash Chandra Venkata SADHU ,  Bharath PATIL

IPC: G01S7/4915 ,  G01S17/36 ,  G01S17/894 ,  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.

公开(公告)号：US20190178993A1

公开(公告)日：2019-06-13

申请号：US15834178

申请日：2017-12-07

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Subhash Chandra Venkata SADHU ,  Bharath PATIL ,  Jaiganesh BALAKRISHNAN

IPC: G01S7/486 ,  G01S17/89 ,  G01S17/10 ,  G01S7/484

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.