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Distance measuring sensor

A distance measurement and sensor technology, applied in the field of distance measurement sensors, can solve problems such as high manufacturing costs and expanding the physical size of the optical system

Active Publication Date: 2019-05-24
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the case where (i) two light sources with optical fibers are prepared as described in JP 2004-517352 A, or (ii) the optical fibers for transmitting light from the light sources are branched to different parts to illuminate the mirror, Each beam is emitted in two different directions; as a result, the physical size of the optical system must be enlarged, thus resulting in higher manufacturing costs

Method used

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Examples

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no. 1 example

[0034] The first embodiment is described below. The distance measurement sensor according to the present embodiment is mounted to a vehicle, and it is configured to measure the distance between the vehicle and an object by light transmission and light reception. This specification describes a frequency modulated continuous wave (hereinafter "FMCW") distance measurement sensor that calculates the distance to an object by heterodyne detection that combines transmitted and received beams and checks for frequency differences.

[0035] Such as figure 1 with figure 2 As shown, the distance measurement sensor includes: a light source 1; an emitter 2 for emitting light generated by the light source 1 to the outside of the light source 1; and a scanner 3 configured to perform scanning using a light beam emitted from the emitter 2 . The distance measurement sensor further includes: an optical receiver 4 configured to receive a light beam from the outside; and a processor 5 configure...

no. 2 example

[0091] The second embodiment is described below. Compared with the first embodiment, the present embodiment involves modification of the configuration of the chip 15 . Since other parts in this embodiment are similar to those in the first embodiment, only the parts different from the first embodiment will be described below.

[0092] Figure 7 It is shown that the distance measuring sensor according to the present embodiment comprises a single chip 15 with two SOAs 7 . The two transmitters 2 are each configured by two optical waveguides 20 in a single chip 15 . Notice Figure 7 Illustration of the optical receiver 4, the processor 5, and the like is omitted.

[0093] Since the two SOAs 7 are located in a single chip 15, the number of components can be reduced, thereby reducing the size of the distance measuring sensor. Therefore, it is easier to manufacture distance measuring sensors. Furthermore, the cost of manufacturing the distance measuring sensor can be further red...

no. 3 example

[0095] The third embodiment is described below. Compared with the first embodiment, this embodiment involves a modification of the method for identifying a light source. Since other parts in this embodiment are similar to those in the first embodiment, only the parts different from the first embodiment will be described below.

[0096] In this embodiment, the frequency of the light beam emitted from one of the two emitters 2 is different from the frequency of the light beam emitted from the other of the two emitters 2 . For example, the difference on the order of THz is between fA0, fA1 and fB0, fB1.

[0097] By providing a frequency difference, the processor 5 can detect the beat frequency, as described below. When the light beam emitted from the light source 1a is incident on the optical receiver 4a, a beat frequency equal to or less than GHz order (for example, about 1 GHz) can be detected in heterodyne detection, as shown by Figure 8 Indicated by arrows A and B. On th...

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Abstract

A distance measuring sensor includes: a light source (1) having a semiconductor optical amplifier (7) and a resonator (8) with a silicon photonic circuit, which are at a semiconductor substrate (6); aplurality of emitters (2), each emitter (2) configured to emit a light beam generated by the light source to outside of the light source; a scanner (3) configured to perform scanning with the light beam by enabling the light beam emitted from the light source to be reflected at a mirror and vibrating the mirror; an optical receiver (4) configured to receive a reflected light beam, which is generated by the light beam reflected at the object; and a processor (5) configured to measure the distance to the object based on the reflected light beam received at the optical receiver (4). Light beamsrespectively emitted from the emitters are incident on the mirror in different directions. The scanner performs scanning different regions with the respective light beams.

Description

technical field [0001] The present disclosure relates to a distance measuring sensor. Background technique [0002] LIDAR (Light Detection and Ranging) has been used, for example, to detect the distance to an object by using lasers. In addition, LIDAR mounted to a vehicle needs to scan at a wide angle. [0003] For example, JP 2004-517352 A discloses a distance measuring sensor including two light sources each having an optical fiber. The distance measuring sensor illuminates the mirror with two kinds of light generated by two light sources respectively. Two kinds of light are emitted from two different directions. Two different beams of light reflected from the mirror then illuminate different areas. This type of distance measuring sensor can illuminate an area with a mirror twice the usual width, which has a limited range of motion. [0004] Since the flexibility of the installation position of LIDAR in the vehicle is important, miniaturization of the device and wide-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/08G01S17/34
CPCG01S7/4818G01S7/4817G01S17/34
Inventor 种村友贵大山浩市
Owner DENSO CORP
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