Flute acoustics: measurement, modelling and design - School of ...

4.4. CONCLUSIONS AND FURTHER DIRECTIONS 67
1.2
1
t = 1.0 mm
t = 2.5 mm
t = 5.0 mm
0.8
0.6
t a
/ a
0.4
0.2
0
0.2
0.5 0.6 0.7 0.8 0.9 1
b / a
Figure 4.12: The series length correction t a for closed finger holes and fit formula (4.12).
with a removable plug of resin. (The plug would then be reamed smooth to match the bore.)
The measurement system could then be calibrated with the plug in place and then the hole
could be measured after removal of the plug. This procedure possesses the additional advantage
that there is no need to dismantle the apparatus between calibration and measurement.
Due to some systematic errors in the measured data no attempt was made in this chapter
to quantify the resistive components of the T-junction impedances. With more careful measurements
it may be possible to measure these with the system described in this chapter.