DEVICE FOR MEASURING PARTICULATE CONCENTRATION IN MOTOR VEHICLE EXHAUST GASES
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Accused Products
Abstract
A device for measuring a particulate concentration in motor vehicle exhaust gases, has a measuring chamber, which is able to be filled up with a gas-particulate mixture that is to be measured, at least one light source and at least one light sensor. The light sensor detects light that has been scattered by particulates present in the gas-particulate mixture. An exhaust gas supply device is developed to supply exhaust gas, that is to be measured, to the measuring chamber. A null gas low in particulates is able to be supplied from a null gas source to the measuring chamber. A switching element, which is situated between the exhaust gas supply device and the measuring chamber, is suitable for admitting or forestalling the supply of exhaust gas into the measuring chamber on an optional basis.
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Citations
20 Claims
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1-10. -10. (canceled)
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11. A device for measuring a particulate concentration in motor vehicle exhaust gases, comprising:
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a measuring chamber which is able to be filled up with a gas-particulate mixture; at least one light source and at least one light sensor, the light sensor to detect light scattered by particulates present in the gas-particulate mixture; an exhaust gas supply device to supply exhaust gas that is to be measured to the measuring chamber; a null gas source to provide a null gas that is low in particles; and a switching element situated between the exhaust gas supply device and the measuring chamber, the switching element to admit or forestall a supply of the exhaust gas into the measuring chamber on an optional basis. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification