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Distance measuring device

A technology for distance measurement and time, which is applied in the directions of measuring devices, distance measurement, line-of-sight measurement, etc., and can solve problems such as changes in distance measurement results

Pending Publication Date: 2022-07-08
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] As a result of detailed studies by the inventors, it was found that in a distance measuring device using a plurality of avalanche photodiodes operating in the Geiger mode, the distance measurement result varies depending on the intensity of signal light or the intensity of background light such as sunlight. Subjects such as changes

Method used

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Experimental program
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no. 1 approach

[0040] Below, with the attached Figure 1 The first embodiment of the present disclosure will now be described.

[0041] The distance measuring device 1 of the present embodiment is mounted on a vehicle, and measures distances to various objects existing around the vehicle.

[0042] like figure 1 As shown, the distance measuring device 1 includes an irradiation unit 2 , a light-receiving array unit 3 , a counting unit 4 , and a signal processing unit 5 .

[0043] The irradiation unit 2 repeatedly irradiates pulsed laser light (hereinafter, referred to as signal light) at predetermined intervals, and notifies the counting unit 4 and the signal processing unit 5 of the irradiation timing. Hereinafter, the period during which the laser light is irradiated will be referred to as a measurement period.

[0044] The light-receiving array section 3 includes a plurality of pixel units P1, P2, . . . , Pk. K is an integer of 2 or more. Each pixel unit Pi includes N photodetectors 31...

no. 2 approach

[0108] Below, with the attached Figure 1 The second embodiment of the present disclosure will now be described. In addition, in the second embodiment, different parts from the first embodiment will be described. The same reference numerals are attached to the same configuration.

[0109] The distance measurement device 1 of the second embodiment differs from the first embodiment in that the distance measurement process is changed.

[0110] like Figure 11 As shown, the distance measurement process of the second embodiment differs from the first embodiment in that the process of S82 is executed instead of S80.

[0111] That is, when the process of S70 ends, the CPU 51 corrects the fall time Td in S82, and transfers to S90.

[0112] like Figure 12 As shown, if a photon is incident on the SPAD61, the SPAD61 breaks down and a current flows through the quenching resistor 62, and a voltage drop occurs in the quenching resistor 62, so the voltage across the SPAD61 is V SPAD T...

no. 3 approach

[0126] Below, with the attached Figure 1 A third embodiment of the present disclosure will now be described. In addition, in the third embodiment, different parts from the first embodiment will be described. The same reference numerals are attached to the same configuration.

[0127] The distance measuring device 1 of the third embodiment differs from the first embodiment in that the configuration of the distance measuring device 1 is changed and the distance measuring process is changed.

[0128] like Figure 15 As shown, the distance measuring device 1 of the third embodiment differs from the first embodiment in that a temperature sensor 7 is added.

[0129] The temperature sensor 7 detects the temperature of the light-receiving array unit 3 and outputs a temperature detection signal indicating the detection result to the signal processing unit 5 .

[0130] like Figure 16 As shown, the distance measurement process of the third embodiment differs from the first embodim...

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Abstract

A distance measurement device (1) is provided with an irradiation unit (2), a light receiving array unit (3), a signal intensity calculation unit (S50), a signal time calculation unit (S60), intensity correction units (S70, S82, S76, S86), and distance calculation units (S110, S120). The irradiation unit irradiates pulse-shaped signal light. The light-receiving array unit is provided with a plurality of photodetectors (31) that output a pulse signal by the incidence of photons. The signal intensity calculation unit calculates the signal intensity of the received signal light. The signal time calculation unit calculates a rise time and a fall time of the detected signal light. The intensity correction unit corrects at least one of the rise time and the fall time on the basis of the signal intensity. The distance calculation unit calculates the object distance on the basis of at least one of the corrected rise time and the corrected fall time.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This international application claims priority based on Japanese Patent Application No. 2019-204614 filed with the Japan Patent Office on November 12, 2019 and Japanese Patent Application No. 2020-166004 filed with the Japan Patent Office on September 30, 2020 right, and the entire contents of Japanese Patent Application No. 2019-204614 and the entire contents of Japanese Patent Application No. 2020-166004 are incorporated by reference into this international application. technical field [0003] The present disclosure relates to a distance measuring device that irradiates light and measures the distance to an object that reflects the light. Background technique [0004] Patent Document 1 describes a distance measuring device that measures the time from irradiation to light reception by irradiating pulsed signal light and receiving reflected light from an object, and measures the distance to an object that reflects the ...

Claims

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Application Information

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IPC IPC(8): G01S7/493G01C3/06G01S7/4865G01S17/14
CPCG01S17/10G01S7/4865G01C3/06G01S7/487G01S17/931G01S7/4876
Inventor 东谦太
Owner DENSO CORP
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