Method for determining the spatial concentration of the components of a gas mixture in a combustion chamber

• US 6,335,790 B1
• Filed: 06/02/2000
• Issued: 01/01/2002
• Est. Priority Date: 06/04/1999
• Status: Expired due to Fees

• Current Assignee: FEV Motorentechnik GmbH, Lavision GmbH
• Original Assignee: Lavision GmbH
• Inventors: Andresen, Peter, Lepperhoff, Gerhard
• Primary Examiner(s): Pham, Hoa Q.
• Application Number:
  US09/588,140
• Time in Patent Office: 578 Days
• Field of Search: 356/432, 356/433, 356/434, 356/437, 356/438, 356/440, 356/336, 356/337, 356/338, 356/342, 250/339.13, 250/340, 250/573, 250/222.1, 250/574, 73/240.2, 73/240.6
• US Class Current: 356/240.1
• CPC Class Codes: G01N 33/22 Fuels, explosives liquid hydrocarbons G01N33/28
• CPC Class Codes: G01N 33/2829 mixtures of fuels, e.g. determining the RON-number

Abstract

The invention relates to a method for determining the spatial concentration of the various components of a mixture, in particular of a gas mixture in a combustion chamber, of a motor for example; a laser beam is hereby directed into the combustion chamber; the laser beam brings the particles of the mixture to radiate, whereas this light of the particles is passed backward through a masked lens and is imaged on a display as a radiating surface and the radial intensity distribution is recorded by an array photodetector, whereas the spatial concentration of individual components of the particle mixture may be measured from the radial intensity distribution.

Claims

1. A method for determining the spatial concentration of the various components of a gas mixture in a combustion chamber,

characterized by the steps of:

providing an enclosed combustion chamber;

providing only one observation aperture in a wall of the chamber;

directing a laser beam through the only one aperture into the combustion chamber, where the laser beam rings specific particles of the mixture situated on one line to radiate back-scattered light;

imaging the back-scattered light of these particles as a radiating surface by a masked lens;

recording locally in detail the intensity distribution; and

,

measuring the concentration of the individual components situated along the laser line locally in detail from the radial distribution of intensity.

2. A method according to claim 1,

characterized in that a semi-reflecting mirror is arranged in a path of the laser beam.

3. A method according to claim 1,

characterized in that, in order to image highly precise rings on a display, the lens is opaquely covered in its central part.

4. A method according to claim 1,

characterized in that the radiating surface is imaged on a display.

5. A method according to claim 4,

characterized in that the distribution of intensity is recorded locally and in detail on the display by an array photodetector.

6. An arrangement for performing the method according to claim 1

characterized by a laser that is bunched into the combustion chamber through only one aperture, a semi-reflecting mirror being arranged in the beam path of the laser, a lens being arranged behind the display in the beam path of the back-scattered light by a locally resolving photodetector.

7. An arrangement according to claim 6,

characterized in that the lens is opaquely covered in its central part.