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227 views
04:52 Mar-09-2005
Kenichi Fujisaki
ultrasonic investigation of the engraving rate

I'm research assistant at EPFL.
My project is the development of new technique for engraving sapphire
with high pressure (40 bars up to 500 bars) and temperature (normally:
about 300 °C, but can be up max. to 500 °C) water.

The experiment is the following: the sapphire sample and water are put
in a gold capsule (perfectly sealed). This capsule reaches high
pressure and temp. with an autoclave.
The sapphire will be etched when it is submitted to such condition.

The capsule diameter is 4 mm and the length: 5 cm. (see drawing:
attachment)

sapphire thickness: 1mm, diamater: 3 mm, estimated sound velocity: 10
km/s.

I would like to inspect in real time the engraving rate.
The simplest and the most promising way (to my knowledge) to get result
is an ultrasonic investigation. (Of course, It also my intention to
investigate the physical property of the system)
It was recommended to me to proceed with a LiNbO3 transducer.
The idea is to get a frequency response spectrum of a continuous
ultrasonic waves (-> several MHz). The signature of sapphire engraving
is the peek(s) (or eigenfrequencies) which move(s) according to time.

Is it simple or feasible to get engraving depth once we get the
eigenfrequency?
Is my idea realistic?
May I speak to you further about my project? Could you redirect me to
people who can help me.

Thank you
Regards,
KF



 


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