Method and system for fast inspecting vehicle based on measure lengths

• US 10,527,525 B2
• Filed: 05/20/2019
• Issued: 01/07/2020
• Est. Priority Date: 12/04/2015
• Status: Active Grant

• Current Assignee: Nuctech Company Limited (Tsinghua Tongfang Co., Ltd.)
• Original Assignee: Nuctech Company Limited (Tsinghua Tongfang Co., Ltd.)
• Inventors: Xu, Yanwei, Yu, Weifeng
• Primary Examiner(s): LaPage, Michael P
• Application Number:
  US16/416,934
• Publication Number:
  US 20190301976A1
• Time in Patent Office: 232 Days
• CPC Class Codes: G01B 11/04 specially adapted for measuring length or width of objects while moving
• CPC Class Codes: G01M 17/007 Wheeled or endless-tracked vehicles G01M17/08 takes precedence
• CPC Class Codes: G01N 2223/03 by transmission
• CPC Class Codes: G01N 2223/05 by diffraction, scatter or reflection
• CPC Class Codes: G01N 2223/631 large structures, walls
• CPC Class Codes: G01N 23/04 and forming images of the material
• CPC Class Codes: G01V 5/22 Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays
• CPC Class Codes: G01V 5/232 having relative motion between the source, detector and object other than by conveyor G01V5/226 takes precedence

Abstract

A method and a system for fast inspecting a vehicle based on a length measuring device, including: when a subject vehicle enters an inspection region, measuring a first length and a second length of the subject vehicle; determining whether the first length and the second length is respectively larger than or equal to a preset second length threshold; if so, determining whether a gap portion of the subject vehicle between a first portion and a second portion of the subject vehicle appears in a beam emitting region formed by a beam of radiation rays emitted by the system for fast inspecting a vehicle; and when the gap portion appears in the beam emitting region, emitting a beam of radiation rays of a first radiation dose to the subject vehicle according to the gap portion, wherein the subject vehicle moves with respect to the system for fast inspecting a vehicle.

Claims

1. A method for fast inspecting a vehicle, which is applied in a system for fast inspecting a vehicle, the method comprising:

step (a), when a subject vehicle enters an inspection region, measuring a first length and a second length of the subject vehicle;

step (b), determining whether the first length is larger than or equal to a preset first length threshold and the second length is larger than or equal to a preset second length threshold;

step (c), if the first length is larger than or equal to the first length threshold and the second length is larger than or equal to the second length threshold, determining whether a gap portion of the subject vehicle between a first portion and a second portion of the subject vehicle appears in a beam emitting region formed by a beam of radiation rays emitted by the system for fast inspecting a vehicle; and

step (d), when the gap portion appears in the beam emitting region, emitting a beam of radiation rays of a first radiation dose to the subject vehicle according to the gap portion,

wherein the subject vehicle moves with respect to the system for fast inspecting a vehicle.

2. The method for fast inspecting a vehicle according to claim 1, wherein before the step (a), the method further comprises:

when the subject vehicle enters the inspection region, measuring a width of the subject vehicle;

determining whether the width of the subject vehicle is larger than a preset width threshold; and

if the width of the subject vehicle is larger than the width threshold, performing the steps (a) to (d).

3. The method for fast inspecting a vehicle according to claim 1, wherein the step (a) further comprises:

when the subject vehicle enters the inspection region, measuring a width of the subject vehicle;

the step (b) further comprises;

determining whether the width of the subject vehicle is larger than a preset width threshold; and

the step (c) further comprises;

if the first length is larger than or equal to the first length threshold, the second length is larger than or equal to the second length threshold, and the width of the subject vehicle is larger than the width threshold, determining whether a gap portion of the subject vehicle between a first portion and a second portion of the subject vehicle appears in the beam emitting region.

4. The method for fast inspecting a vehicle according to claim 1, wherein the first length is a length of the first portion of the subject vehicle, and the second length is a sum of lengths of the first portion, the second portion and the gap portion of the subject vehicle;

or the first length is a length of the first portion of the subject vehicle, and the second length is a length of the second portion of the subject vehicle.

5. The method for fast inspecting a vehicle according to claim 1, wherein emitting a beam of radiation rays of a first radiation dose to the subject vehicle according to the gap portion comprises:

determining an appearing time when the gap portion appears at a finishing position of the beam emitting region, and emitting the beam of radiation rays of the first radiation dose to the second portion of the subject vehicle at the determined appearing time.

6. The method for fast inspecting a vehicle according to claim 5, wherein determining an appearing time when the gap portion appears at a finishing position of the beam emitting region comprises:

continuously detecting data returned by the radiation rays at the finishing position of the beam emitting region, determining whether an absolute value of a difference in a change in the returned data from a first value to a second value is larger than a preset first threshold, the first value being smaller than the second value, determining a time when the change occurred, wherein the determined time is determined as the appearing time.

7. The method for fast inspecting a vehicle according to claim 1, wherein emitting a beam of radiation rays of a first radiation dose to the subject vehicle according to the gap portion comprises:

determining an appearing time when the gap portion appears at a finishing position of the beam emitting region, and emitting the beam of radiation rays of the first radiation dose to the second portion of the subject vehicle at a predetermined time after the determined appearing time.

8. The method for fast inspecting a vehicle according to claim 7, wherein the predetermined time is determined according to a predetermined distance and a relative moving speed of the subject vehicle with respect the system for fast inspecting a vehicle.

9. The method for fast inspecting a vehicle according to claim 1, wherein emitting a beam of radiation rays of a first radiation dose to the subject vehicle according to the gap portion comprises:

determining a leaving time when the gap portion leaves the finishing position of the beam emitting region, and emitting the beam of radiation rays of the first radiation dose to the subject vehicle at the determined leaving time.

10. The method for fast inspecting a vehicle according to claim 9, wherein determining a leaving time when the gap portion leaves the finishing position of the beam emitting region comprises:

continuously detecting data returned by the radiation rays at the finishing position of the beam emitting region, determining whether an absolute value of a difference in a change in the returned data from a first value to a second value is larger than a preset second threshold, the first value being larger than the second value, determining a time when the change occurred, wherein the determined time is determined as the leaving time.