The optical sensor reacts to a point on the spindle and
then send a high signal to the trig-ext input of the DAQ.
This signal is required for making the two laser
displacement sensors work at the same time.
The total delay time of the DAQ consists of the
following factors: response speed of the optical sensor,
response speed of the laser displacement sensor, and the
sampling rate of the DAQ. The resulting time is related
to the angle of spindle movement, and can be calculated
if the angular velocity is known. With a measured
delay time of 55 µs and a given spindle velocity of
12.000 rpm, the corresponding angle would be
approximately 4°. Equation 1 shows the relationship
between delay time and spindle angle.
T ൌ ሺୱሻሺ୰୮୫ሻ
ன െ 55ሺµsሻ (1)
ω: Spindle velocity ሺrpmሻ
The DAQ program is built using equation (1). Fig. 7 and
Fig. 8 show the front-panel and block diagram using
LabView.
This system outputs its measured data as a graph and as
an excel file.
Fig. 7 Front-panel of measurement system
The front-panel is the user interface of the virtual
instrument (VI). The data acquisition, processing, and
display can be controlled through this panel. The front
panel has buttons, knobs, and control indicators for the
output of the program. User can input data through a
keyboard and mouse, and the user can see directly the
results that are calculated by the program.
Fig. 7 shows the real-time output of sensor A, sensor B,
and the total sum of both these sensors. The graph on
the front-panel displays the output against time. The
user can also change from the front-panel, the sampling
time, and the triggering-level as rising edge or falling
edge.
After entering the spindles speed at the VI, the delay
time can be calculated. The start trigger signal comes
after this delay time. This is essential for measuring the
wanted point at the spindle.
The advantage of the system used in this experiment is
that after entering the hardware settings once at a
specified spindle speed, it does not have to be changed
again for different spindle speeds, because the delay
time is calculated automatically by the VI.
The optical sensor reacts to a point on the spindle and
then send a high signal to the trig-ext input of the DAQ.
This signal is required for making the two laser
displacement sensors work at the same time.
The total delay time of the DAQ consists of the
following factors: response speed of the optical sensor,
response speed of the laser displacement sensor, and the
sampling rate of the DAQ. The resulting time is related
to the angle of spindle movement, and can be calculated
if the angular velocity is known. With a measured
delay time of 55 µs and a given spindle velocity of
12.000 rpm, the corresponding angle would be
approximately 4°. Equation 1 shows the relationship
between delay time and spindle angle.
T ൌ ሺୱሻሺ୰୮୫ሻ
ன െ 55ሺµsሻ (1)
ω: Spindle velocity ሺrpmሻ
The DAQ program is built using equation (1). Fig. 7 and
Fig. 8 show the front-panel and block diagram using
LabView.
This system outputs its measured data as a graph and as
an excel file.
Fig. 7 Front-panel of measurement system
The front-panel is the user interface of the virtual
instrument (VI). The data acquisition, processing, and
display can be controlled through this panel. The front
panel has buttons, knobs, and control indicators for the
output of the program. User can input data through a
keyboard and mouse, and the user can see directly the
results that are calculated by the program.
Fig. 7 shows the real-time output of sensor A, sensor B,
and the total sum of both these sensors. The graph on
the front-panel displays the output against time. The
user can also change from the front-panel, the sampling
time, and the triggering-level as rising edge or falling
edge.
After entering the spindles speed at the VI, the delay
time can be calculated. The start trigger signal comes
after this delay time. This is essential for measuring the
wanted point at the spindle.
The advantage of the system used in this experiment is
that after entering the hardware settings once at a
specified spindle speed, it does not have to be changed
again for different spindle speeds, because the delay
time is calculated automatically by the VI.
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