How to use a reading microscope
1. How to use:
1. Place the instrument on the object to be measured, so that the measured part of the object to be measured is illuminated by natural light or light, and then adjust the screw of the eyepiece to make the reticle and the object image clearly visible in the field of view at the same time;
2. When measuring, first rotate the reading drum to move the glass reticle engraved with filaments, and at the same time turn the reading microscope slightly so that the vertical filaments are aligned with the measured part for measurement;
3. See a magnified circular hole dent in the field of view. When measuring, first rotate the reading drum to make the vertical filament in the field of view tangent to one side of the circular hole dent, get a reading, and then rotate the reading Drum, so that the vertical filament is tangent to the other side of the hole dent, and another reading is obtained;
4. The diameter of the dent in the round hole is the difference between the secondary readings, and it is the thickness of the insulation
2. Matters needing attention:
1. When the instrument can be used normally, never disassemble it by yourself, otherwise it will damage the original accuracy of the instrument;
2. When storing and using the instrument, avoid dust, humidity, overheating and acid-base vapor;
3. Dirt on the lens surface must be wiped with soft objects such as absorbent cotton, soft brush, and lens paper. When encountering oil stains, use absorbent cotton dipped in a little alcohol and ether mixture to gently wipe it.
Three examples:
1 Put the micrometer microscope on the surface of the object to be measured, with the notch of the mirror base facing the direction of the light, press and hold the mirror base to adjust the eyepiece so that the reticle in the visual field can be adjusted clearly, and turn the focus ring of the mirror base to make the measured object The enlarged image of the objective lens is clearly on the reticle of the eyepiece, loosen the locking lens holder to fix it, and then lock it again after aligning the object to be measured. To aim at the image of the object to be measured, it is necessary to measure the boundary of the area, read the integer value on the fixed ruler plus the mantissa value on the micrometer drum to read the starting point of the boundary of the object image to be measured, and then turn the micrometer drum to make With a cross and a double-line reticle to aim at the other end of the area to be measured, read the integer value on the fixed ruler plus the mantissa value on the micrometer drum, which is the end point reading of the image boundary of the measured object, two The difference between the reading values (a-b) is divided by the magnification of the objective lens (X), (a-b)÷x=Y is the measured value of the actual measured object.
2 Measuring Newton's rings with a reading microscope
The radius of curvature of a lens is measured with Newton's rings.
Put the convex surface of a plano-convex lens with a large radius of curvature on a flat glass plate and keep it in point contact. At this time, if it is illuminated by vertical monochromatic light, interference will occur between the upper and lower surfaces of the air layer outside the contact point, and is The light and dark halo with the contact point as the center is called Newton's circle in physics. Because the thickness of the air layer at the light (or dark) circle is equal, it is called equal-thickness interference.
