In a profile projector, the magnified image of the workpiece is created by:

Explanation:

Profile Projector

Definition: A profile projector, also known as an optical comparator, is an instrument used for measuring and inspecting the dimensions and geometry of manufactured parts. It works by projecting a magnified image of the workpiece onto a screen, allowing for precise measurements and comparisons against standards or blueprints.

Working Principle: The key component in a profile projector is the projection lens, which creates the magnified image of the workpiece. The workpiece is placed on a stage, and light is directed through it. The projection lens then captures the light passing through or reflected by the workpiece and projects it onto a screen. The magnified image on the screen can be measured using various tools, such as a micrometer or digital readout, to determine the dimensions and geometry of the part with high accuracy.

Projection Lens: The projection lens is responsible for creating the magnified image. It ensures that the image is clear and accurate, allowing precise measurements. The quality and design of the projection lens are crucial for the overall performance of the profile projector. It must minimize distortions and aberrations to provide a true representation of the workpiece.

Advantages:

• High accuracy and precision in measurements.
• Non-contact measurement method, preventing any potential damage to the workpiece.
• Ability to measure complex shapes and profiles that might be difficult to measure with traditional tools.

Disadvantages:

• Relatively high cost compared to some other measurement tools.
• Requires a stable and vibration-free environment to ensure accurate measurements.

Applications: Profile projectors are widely used in manufacturing and quality control processes, particularly in industries such as aerospace, automotive, and precision engineering. They are essential for ensuring that parts meet strict dimensional tolerances and quality standards.

Analysis of Other Options:

1) Mirrors: While mirrors can be used in optical instruments to direct and reflect light, they are not typically used to create the magnified image in a profile projector. Mirrors might be part of the system to direct light, but the actual magnification is achieved by the projection lens.

2) A Vernier Micrometer: A Vernier micrometer is a precision measurement tool used to measure small dimensions with high accuracy. It is not used to create magnified images. Instead, it is used to measure the dimensions of objects directly.

4) Condenser Lens: A condenser lens is used to focus light onto the workpiece, improving the illumination and contrast of the image. While it plays a role in the optical system, it does not create the magnified image. The magnification is achieved by the projection lens.