Meiji Techno MT9000 Series Especificaciones descargar pdf (Pagina 18)

3.3 The Bertrand Lens

Conoscopic Observation

"lnterference

Figure" is

phenomena

which details what

a specimen

produces

at the rear focal

plane

of a transmitted

light lens

system.

This

colorful figure is used for material diagnosis

and

identilication.

Intereference

Figures are achieved with certain specimens like

crystals

which

field of view becomes

extinct

when

viewed under crossed oolars.

perform

conoscopic

observation

Place

your

specimen on the stage, usually a

prepared

slide.

Engage

the

40x

objective by

rotating

the nosepiece into that

position.

Bring

your

specimen

into focus.

Turn up the transmitted light

illuminator

up all the way to its

brightest setting.

Note: Objectives should be centered otherwise specimen detail may move

out of the field of view when

turning

the stage.

Engage the analyzer

which

is the only slider below the viewing head

and swing in the

polarizer

which

is located

just

above

the transmitted light illuminator.

While

looking into

the eyetubes, remove the specimen

and

rotate

the

polarizer

and find the

point

which the field

becomes

"extinct"

or darkened and then re-position

your

specimen.

Engage the Bertrand lens

rotating the wheel

directly below the viewing head from

"O"

"8"

setting

printed

on the

wheel.

lmmediately,

one should observe some type of

interference

figure

somewhat similar to what is shown

below.

Rotate

the stage to observe the movement and coloration

the isochromes

and isogyres which

are

the colored

and blackened

figures

you

observe.

Conoscopic

cannot be observed under

vertical lllumination

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Meiji Techno MT9000 Series Especificaciones Pagina 18

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