In these systems, we integrate micro-optic elements into sensor units for the detection of flame radiation in the SI engine. The arrangement of sensor elements in a multi-channel configuration extends the simple flame radiation information into spatial information about flame properties such as the flame kernel growth and flame front propagation.The AVL visiofem is an optical measuring system for the acquisition and visualisation of flame luminosity in gas and gasoline engines. It allows up to four light signals, decoupled from the combustion chamber by fibre-optic sensors, to be digitised with crank angle resolution.The AVL visiofem output signals are connected to any indicating system. The AVL visiofem is controlled by the AVL indicom indicating software or by PC software.The optical sensors that can be used with the AVL visiofem register the flame luminosity from the compression volume of the combustion chamber by means of micro-optic elements fitted in spark plugs.The AVL visiofem sensor is a spark plug sensor that enables the user to investigate the formation of the flame kernel by means of eight cones of vision. Together, the two sensors permit the assessment of the curve of the flame luminosity in the combustion chamber
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