Accu-Scope 3025 Manual del propietario

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3025 Microscope

Phase Contrast –Turret System

SUPPLEMENTAL INSTRUCTIONS

PHASE CONTRAST MICROSCOPY

The normal microscopic object is seen because it has regions of varying density. In normal brightfield illumination a

completely transparent specimen is very difficult to observe in detail because all areas of the specimen are equally dense.

Darkfield illumination displays border effects in completely transparent specimens due to edge scattering and diffraction of

light. Polarized light is useful when transparent specimens have directional or crystalline properties.

Phase contrast microscopy is a type of illumination system to observe transparent media. This form of illumination is

utilized extensively in the study of transparent living cells without the need for staining or fixing while being able to obtain

good image contrast. The light from phase contrast illumination arrives at the user’s eyes at ½ the normal wavelength.

This light altering system produces a visible image of an otherwise invisible, transparent specimen.

The optical light path necessary for phase contrast is shown in Figure 1. A clear annulus in the focal plane of the

condenser is imaged at infinity by the condenser and then re-imaged by the objective in its rear focal plane. The

undiffracted light passes through this image. It is reduced in intensity and given a one-quarter wave phase shift by means

of an annular phase pattern in the rear focal plane of the objective. These two changes in the undiffracted portion of the

beam simulate the phase and intensity distribution which would be present in the objective focal plane if the specimen had

density variations rather than refractive index variations. As a result, the image formed by the beam interfering with the

diffracted beam simulates that of a specimen having density variations.

IMAGE FORMATION BY PHASE CONTRAST

An annular aperture in the diaphragm placed in the focal plane of the substage condenser controls the illumination of the

specimen. The aperture is imaged by the condenser and objective at the rear focal plane or at the exit pupil of the

objective. A phase shifting element, or phase plate, is placed in the image plane. Light passing through the phase altering

pattern acquires a ¼ wave length advance over that diffracted by the object structure and passes through that region of

the phase plate not covered by the altering pattern. The resultant interference effects of the two portions of light form the

final image. Altered phase relations in the illumination rays, induced by otherwise invisible elements in the specimen, are

translated into brightness differences by the phase altering plate.

3025 Microscope Phase Contrast –Turret System Instructions

Installation of the Phase Contrast Components

& Alignment of the Condenser to the Optic Axis of the Microscope

1. Mount the Phase Contrast objectives onto the nosepiece—clockwise lowest to highest magnification.

2. Install the Phase Contrast Turret-style condenser onto the condenser carrier.

3. Raise the condenser carrier rack to its highest position.

4. Position the condenser turret rotating plate to the “BF” position. (Make certain the condenser diaphragm is fully open).

5. Select the 10x objective.

6. Place a “stained slide” specimen on the stage and focus the microscope.

7. Close the field diaphragm, then lower the condenser until an image of the field diaphragm comes into focus on the

object plane.

8. Partially open the field diaphragm until the image of the diaphragm is close to the edge of the field of view. Adjust the

condenser carrier “centering screws” to align the condenser to the microscope optical axis.

Aligning the Annuli in the Phase Contrast Condenser-turret

To the Phase Rings in the Phase Contrast Objectives

1. Rotate the nosepiece to the 20x Phase objective.

2. Replace the “stained slide” with a phase contrast specimen (i.e., a fresh “cheek cell” preparation).

3. Remove one eyepiece and install the supplied alignment telescope. Focus the telescope on the phase ring inside the

objective.

4. Rotate the condenser-turret to its “10/20” position. As you observe through the telescope you will see two different

rings, See illustration Phase Plate and Light Annulus Alignment.

5. The condenser-turret has two adjusting screws. Use these adjusting screws to align the 10/20 annular light ring in the

condenser-turret to the phase ring in the 10x objective. (The 10/20 annulus will now function with both the 10x and 20x

Phase objectives).

6. Repeat the above annulus alignment procedure for the 40x and 100x Phase objectives.

3025 Microscope Phase Contrast –Turret System Instructions

TROUBLESHOOTING GUIDE

PHASE CONTRAST MICROSCOPY

PROBLEM

CAUSE

CORRECTIVE MEASURE

Poor phase

contrast image

is obtained

The condenser phase annulus image and

the objective phase plate are not aligned

Adjust the phase annulus so that it is

aligned with the objective phase plate.

The condenser phase annulus and the

objective phase code do not match.

Rotate the phase annulus selector wheel to

the position that matches the objective in

use

The phase difference of the specimen is too

large.

Prepare the specimen using a different

refractive index immersion fluid

The specimen cover glass is incorrect

Replace with 0.17mm thick cover glass

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