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Coating
Sensor Crystal 6MHz |
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Optical coating thickness layer control censor 6MHz |
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- Gold Coating for reliable coating control
- Aluminum coating option able
- Longer crystal life for multi layer
- High quality Scratch Dig and chip control
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Description |
Specification |
Center
Frequency |
6MHz |
Surface |
Plano-Convex |
Diameter |
0.55" |
Quartz
axis |
AT
cut |
Packing
methods |
Plastic
tray 6pcs/tray |
Delivery |
2
weeks from P/O date |
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¡á SHiNWOO offers blank orders.
Always welcome for material requirement from sensor manufacturers |
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The quartz crystal microbalance(QCM) is based
on piezoelectric effect. The resonance frequency of quartz
crystal was influenced by thickness of AT cut crystals.
If additional material is uniformly deposited on the face
of the crystal, the additional thickness will decrease
the resonant frequency of the acoustic wave. This frequency
shift due to mass deposition may be correlated to the
absolute mass deposited via the following substituted
form of the Sauerbrey equation: |
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¥ñq :the density of quartz,
Aq :area of resonance,
Nq : frequency constant for AT-cut quartz crystals
(1.668 X 105 Hz cm),
Fq :the frequency of quartz prior to deposition,
F : the frequency at any point during the deposition
process.
(Equation valid until 2% total frequency change from
starting frequency)
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It is monitored through the frequency shift
when added coating layer. The results are appeared to
thicker the crystal, the longer the resonance wavelength.
The film density value is input in order to compensate
the density difference between the film deposited and
the density of quartz which is 2.648 g/cc.
Our crystals are plano-convex, meaning they are thicker
at the center than the edges.
Given the wide variety of coating technologies available
to the thin film engineer and scientist, it can be difficult
to determine the best monitor crystal type for a given
process. We will attempt to generally categorize processes
and the appropriate crystals. |
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6 MHz 
