The article deals with deformational measuring method
that facilitates measurement of injection rates at each hole
of the multihole injection nozzles. The criterion of the injected
fuel is expressed by the deformation of membrane
occurring due to the rapid rise of the fuel in the measuring
space and the collision of the pressure wave against the
membrane. The pressure wave is generated by the injection
of the fuel into the measuring space. For each hole of the
nozzle the measuring device must have a measuring space
of its own into which fuel is injected as well as its measuring
membrane and its own fuel outlet. Fuel escaping from
the measuring device is conducted into the graduated cylinders
for measuring the volumetric flow through each hole of
the nozzle. The deformations of the membrane are measured
with strain gauges glued to membrane. Strain gauges are
connected to Wheatstone bridge that has to be temperature
compensated, because measuring device warms up during
measurements