App212 en measuring-vibrations-engine-manifold

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App212 en measuring-vibrations-engine-manifold

  1. 1. A212_eLaser sensoroptoNCDTMeasuring vibrations on an engine manifoldOptimizing the processes within an internal combustion The vibrations expected can be accurately recorded,engine is becoming increasingly important in this day and thanks to the sensor‘s fast sampling frequency (2.5 kHz)age. A whole series of measurements is vital for engine and they can easily be evaluated via an interface to themanagement purposes. The temperature of the exhaust PC.gas is one important source and is recorded using a ther-mocouple within the manifold. Demands on the measuring system:To check the way it is attached, it is necessary to examine - Measuring range 20mmthe propensity to vibrate, as well as the mechanical rigi- - Accuracy down to 20µmdity of the structure. This is an application where the blue - Measurement on red-hot objectslaser comes to the fore. The high temperatures in the flowof exhaust gas leads to the thermocouple self-fluorescing(becoming red hot).Due to the short wavelength of the blue-violet laser em-ployed, the light emitted from the thermocouple does notdazzle the sensor, as the long-wavelength intrinsic incan-descence is a long way off the 405-nm wavelength of theblue-violet laser, and it is effectively blocked by the highquality interference filters used.A narrow slit provides the free space needed for the op-tics. The high ambient temperatures are reduced effec-tively for test operation by means of a protective plate,while a blower ensures clean optical conditions and thecooling required.Micro-Epsilon A member of micro-epsilon groupKönigbacher Straße 15 Tel. 0 85 42/1 68-0 info@micro-epsilon.com Certified DIN EN ISO 9001 : 200094496 Ortenburg Fax 0 85 42/1 68 90 www.micro-epsilon.com Modifications reserved / 9781212-A011071FHF

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