Analysis device for determining particulate matter
First Claim
1. An optical analysis device (10) for determining particulate matter, said optical analysis device (10) comprising,three light sources (L1, L2, L3) for transmitting three transmitted light beams (S1, S2, S3) having different wavelengths;
- an apparatus (22) for combining the three transmitted light beams (S1, S2, S3) on a common optical path (24);
a measurement volume (25) into which gas charged with particulate matter can be introduced and in which the transmitted light (S1, S2, S3) is incident on the gas to be measured and is scattered at the particulate matter and a center (29) is defined in the measurement volume from where scattering angles (α
) are defined, with the optical axis in the forward scattering direction defining the scattering angle 0°
;
a light absorption apparatus (30) at 0°
that detects unscattered light;
a first detector (40) that is arranged as close as possible to 0°
directly next to the light absorption apparatus (30) and that detects scattered light in the forward direction;
a second detector (42) that is arranged at a second scattering angle between 7° and
40°
;
a third detector (44) that is arranged at a third scattering angle between 41° and
70°
;
a fourth detector (46) that is arranged at a fourth scattering angle between 71° and
115°
;
a fifth detector (48) that is arranged at a fifth scattering angle between 116° and
145°
;
a sixth detector (50) that is arranged at a sixth scattering angle between 146° and
180°
so that the detectors detect scattered light at the respective angle;
a control and evaluation unit (60) comprising a computer and memory that controls the light sources (L1, L2, L3) using algorithms such that the scattered light is detected in a wavelength selective manner by the detectors (40, 42, 44, 46, 48, 50);
a memory (62) for storing the detected scattered light intensities;
and the control and evaluation unit (60) using algorithms to ultimately determine the size distribution of the particular matter and the particular matter mass percentages from the scattered light intensities.
1 Assignment
0 Petitions
Accused Products
Abstract
An optical analysis device for determining particulate matter includes three light sources having different wavelengths, an apparatus for combining the three transmitted light beams on a common optical path, a measurement volume, an optical axis in the forward scattering direction defines the scattering angle 0°, a light absorption apparatus at 0° that absorbs unscattered light, and six detectors which are arranged at different specified angles which are as close as possible to 0° directly next to the light absorption apparatus, at a second scattering angle between 7° and 40°, at a third scattering angle between 41° and 70°, at a fourth scattering angle between 71° and 115°, at a fifth scattering angle between 116° and 145°, at a sixth scattering angle between 146° and 180°. A control and evaluation unit controls the light sources such that the scattered light is detected in a wavelength selective manner by the detectors.
6 Citations
20 Claims
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1. An optical analysis device (10) for determining particulate matter, said optical analysis device (10) comprising,
three light sources (L1, L2, L3) for transmitting three transmitted light beams (S1, S2, S3) having different wavelengths; -
an apparatus (22) for combining the three transmitted light beams (S1, S2, S3) on a common optical path (24); a measurement volume (25) into which gas charged with particulate matter can be introduced and in which the transmitted light (S1, S2, S3) is incident on the gas to be measured and is scattered at the particulate matter and a center (29) is defined in the measurement volume from where scattering angles (α
) are defined, with the optical axis in the forward scattering direction defining the scattering angle 0°
;a light absorption apparatus (30) at 0°
that detects unscattered light;a first detector (40) that is arranged as close as possible to 0°
directly next to the light absorption apparatus (30) and that detects scattered light in the forward direction;a second detector (42) that is arranged at a second scattering angle between 7° and
40°
;a third detector (44) that is arranged at a third scattering angle between 41° and
70°
;a fourth detector (46) that is arranged at a fourth scattering angle between 71° and
115°
;a fifth detector (48) that is arranged at a fifth scattering angle between 116° and
145°
;a sixth detector (50) that is arranged at a sixth scattering angle between 146° and
180°
so that the detectors detect scattered light at the respective angle;a control and evaluation unit (60) comprising a computer and memory that controls the light sources (L1, L2, L3) using algorithms such that the scattered light is detected in a wavelength selective manner by the detectors (40, 42, 44, 46, 48, 50); a memory (62) for storing the detected scattered light intensities; and the control and evaluation unit (60) using algorithms to ultimately determine the size distribution of the particular matter and the particular matter mass percentages from the scattered light intensities. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification