English: Spark Plug Velocimeter (SPV) shown in 4 stroke engine.
The Spark Plug Velocimeter (SPV) is a magnifying Laser Doppler Velocimeter. The focal range is adjustable to the required proportions of the combustion chamber and characteristics of the shape of the cylinder and the movement.
The velocimeter moves within the outer sleeve. The measurement point is typically variable from 50mm to 0mm from the glass window allowing the user to probe the compression volume.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
{{Information |Description ={{en|1=Spark Plug Velocimeter (SPV) shown in 4 stroke engine. The Spark Plug Velocimeter (SPV) is a magnifying Laser Doppler Velocimeter. The focal range is adjustable to the required proportions of the combustion chamber an