Instrumentation & Measurement Magazine 24-5 - 16
Fig. 6. (a) Normalized output power for various radiuses b(mm), when its thickness is t=0.2 mm, and (b) its corresponding Sensitivity; (c) Normalized output power
for various diaphragm thicknesses t(mm), when its radius is b=15 mm, and (d) its corresponding Sensitivity. (All for a Silicon-Nitride diaphragm: E=300 GPa, ν=0.24;
r0
= 50 μm, r1 = 200 μm, NA = 0.2).
Fig. 7. (a) Normalized output power, (b) sensitivity, and the central distance of diaphragm from the fiber tip as the inset, all versus pressure for various inner
numerical apertures (Silicon-Nitride diaphragm E=300 GPa, ν=0.24, t=0.2 mm, and b=18 mm, r0
= 50 μm, r1 = 200 μm).
inset of Fig. 7b, shows closely parallel lines. It means that the
central displacement ranges are almost unchanged, but with
changing the NA, only the basic distance moves a little. Therefore,
the initial distance h0
various values of NAs.
In another investigation, using Fig. 8a and Fig. 8b, we showed
that the approximation used in (5) and (8) are satisfied by at least
30 times smaller spot sizes on the diaphragm in comparison with
16
will be as depicted in Table 1 for
the diaphragm radius for different NAs. Hence, the respected
setups and approximations are completely admissible.
Fig. 9a shows the normalized output power versus pressure
for various cladding-to-core ratio of the fiber optic r1
Also, Fig. 9b shows that while r1/r0
/r0
.
grows, the sensitivity range
decreases, while its linearity is rising. So, if the applied powermeter
has enough accuracy, r1
/r0
IEEE Instrumentation & Measurement Magazine
of both its linearity and wider sensitivity range.
August 2021
= 4 is a suitable choice because
Instrumentation & Measurement Magazine 24-5
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