Fiber Optic Measurement


With the specialized fiber optic analysis tools, luminosity could be measured to provide parameters previously unavailable

Fiber Optic Spark Plug

Optical Transmission in Visible and UV Range

The optical probes in the spark plug thread receive the luminosity of the combustion and transmit it through flexible fibre optics to highly sensitive optoelectronic receivers which convert the luminosity into a responding voltage.

The high sensitivity of the system permits the analysis of the combustion even at idle speed and cold start.

Optical transmission

Fitting to any mass production spark plug

The special treatment of the spark plug does not change its thermal characteristics significantly because neither the ceramic is harmed nor the heat flow to the outer hull is handicapped.

The robust design of the fibre optic spark plug permits the use even at high temperature and high pressure in mass production engines.

Because of the easy and quick adaptation of the fiber optic spark plug, it is possible to make quick statements about the combustion.

Fitting of any mass production spark plug

Combustion Details Extracted from Light Signals

The reconstruction of the early flame propagation provides a global understanding of the charge motion and allows the analysis of the ignition various operating conditions.

Especially the burning conditions in lean combustion can be analyzed. The signals of the probes can also be used for knock- and misfire-detection.

Optical Signal Analysis


Fiber Optic Spark Plug (FOSP) is an easy-to-use tool to diagnose abnormal combustion phenomenon such as knocking, pre-ignition, soot formation. It can also be used to determine local air/fuel ratio in the area of spark plug.

Flame Kernel Development
Origin of knock
Pre-ignition detection
Determination of soot formation

Flame Kernel Development

Origin of knock

Pre-ignition detection

Determination of soot formation


Fiber Optic Spark Plug


M8, M10, M12, M14

Type of Spark Plugs

not limited

Number of Probes

8 -24

Angle of View

0°- 90°

Observation Cone

7°- 20°

Optical Transmission   

UV - Range

Photo Detectors

Photomultiplier Tubes (PMT)

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