Method and System for Passive Remote Exhaust Emission Measurement

• US 20080116377A1
• Filed: 11/16/2007
• Published: 05/22/2008
• Est. Priority Date: 11/17/2006
• Status: Abandoned Application

• Current Assignee: DPC Technology Limited
• Original Assignee: DPC Technology Limited
• Inventors: Luk, Wai Ming
• Application Number:
  US11/941,328
• Publication Number:
  US 20080116377A1
• Time in Patent Office: Days
• US Class Current: 250/338.5
• CPC Class Codes: G01N 2021/1795 Atmospheric mapping of gases
• CPC Class Codes: G01N 2021/3531 without instrumental source, i.e. radiometric
• CPC Class Codes: G01N 21/3518 Devices using gas filter correlation techniques; Devices using gas pressure modulation techniques
• CPC Class Codes: G01N 2201/0221 Portable; cableless; compact; hand-held

Abstract

The present invention relates to methods and systems for passive remote exhaust emissions measuring, comprising: an infra-red radiation detection sensor array, a lens and a processing unit; wherein the infra-red radiation detection sensor array detects IR radiations in multiple IR regions for a common physical area and generates multiple IR images concurrently at any one time instance, and the processing unit detects and identifies the presence of hotspots of radiation of the IR images by which the concentrations, relative ratio and absolute emission values of various gas components can be calculated.

Claims

1. A passive remote emissions measurement system for simultaneously capturing multiple IR images of emission gases, comprising:

an Infra-red (IR) radiation detection sensor array for detecting and receiving a plurality of IR images in predetermined wavelength bands emitted from the emission plume of vehicles;

a lens for focusing radiation from emission target onto IR radiation sensor array;

a processing unit interconnecting with the IR radiation detection array for analyzing and processing the data collected by the detection array;

characterized in that

the IR radiation detection sensor array comprises combinations of multiple sensors so arranged to simultaneously detect IR radiations in multiple IR regions for a common physical area, allowing for the generation of multiple IR images of multiple IR wavelength bands concurrently at any one time instance;

the processing unit comprises one or more specific software and hardware for

(a) detecting the presence of hotspots of radiation and identifying the hotspots as vehicle emission;

(b) analyzing multiple consecutive IR images captured for calculating the concentrations of various gas components in vehicle emission, the relative ratio of one gas components to the others, or the absolute emission values of each of the gas components.

2. The system as claimed in claim 1, wherein it further comprises an embedded power supply unit.

3. The system as claimed in claim 2, wherein the embedded power supply unit comprises a storage battery.

4. The system as claimed in claim 1, wherein it further comprises an embedded wireless communication unit.

5. The system as claimed in claim 4, wherein the embedded wireless communication unit comprises WiFi, WiMax, bluetooth, GPRS, UMTS, FOMA, WCDMA, CDMA-2000, TD-SCDMA, or HSDPA.

6. The system as claimed in claim 1, wherein it further comprises an image capture unit being interconnected with the processing unit for capturing or recording a color overview image of the target(s).

7. The system as claimed in claim 1, wherein it further comprises optical character recognition sensors to perform automatic character recognition such as automatic license plate recognition functions.

8. The system as claimed in claim 1, wherein it further comprises a panel of switches, buttons, or similar controlling devices for controlling the central module.

9. The system as claimed in claim 1, wherein it further comprises a color or monotone display screen on the surface of the central module to display the functions and status of operations.

10. The system as claimed in claim 9, wherein the display screen comprises a touch-screen control for controlling the central module and to display the functions and status of operations.

11. The system as claimed in claim 1, wherein it further comprises built-in memory

12. The system as claimed in claim 1, wherein it further comprises external memory port for data storage.

13. A method of remote sensing the emissions of a vehicle by passively taking emission information from the target without the need for actively emitting and receiving radiation, comprising the steps of:

simultaneously gathering multiple IR imageries in order to analyze the various spectral properties of the emission target(s) in CO, CO2, HC, NOx, PM, SOx;

differentiating multiple targets by identifying high-intensity emission “

hotspots”

on the emission image;

gathering a predetermined number of consecutive IR imageries to detect speed and acceleration data of target(s);

checking whether there is any transient change between CO and NOX to determine if the target vehicle(s) is(are) in engine transient mode; and

calculating and presenting the concentrations of various gas components thereof, the relative ratio of one gas component to the others, or the absolute emission values of each of the gas components thereof.