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Parallel-axis Theorem

Parallel-axis Theorem

The parallel-axis theorem provides a convenient and quick method of finding the moment of inertia of an object about an axis parallel to the axis passing through its center of mass. Consider a thin rod as an example. There is a striking similarity between the process of finding the moment of inertia of a thin rod about an axis through its middle, where the center of mass lies, and about an axis through its end using the conventional method. In the conventional method, the concept of linear mass...

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Related Experiment Video

Updated: Jun 16, 2026

Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon

Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon

Published on: February 3, 2023

Recording the parallelism of optically contacted Fabry-Perots.

J Meaburn, F Anderson, R F Harrington

|February 20, 2010

Summary

This summary is machine-generated.

A new device accurately measures Fabry-Perot etalon parallelism post-manufacturing. It uses gas pressure tuning and an insect-eye lens to capture simultaneous fringe patterns from multiple areas, ensuring optical quality.

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Area of Science:

Optical physics
Metrology
Instrument development

Background:

Accurate parallelism is crucial for Fabry-Perot etalon performance.
Existing methods for measuring parallelism may be time-consuming or lack precision.
Optically contacted etalons require immediate post-manufacturing assessment.

Purpose of the Study:

To develop a simple and accurate device for measuring the parallelism of optically contacted Fabry-Perot etalons.
To enable rapid assessment of etalon quality immediately after fabrication.

Main Methods:

Construction of a novel measurement device.
Tuning of a Fabry-Perot fringe to an on-axis maximum using controlled gas pressure.
Employing an insect-eye lens for simultaneous imaging of fringe patterns across multiple etalon areas.

Main Results:

The device accurately records the parallelism of optically contacted Fabry-Perots.
Simultaneous imaging captures fringe patterns from numerous small areas efficiently.
The method allows for immediate post-manufacture quality control.

Conclusions:

The developed device offers a simple, accurate, and rapid method for assessing Fabry-Perot etalon parallelism.
This technique facilitates immediate quality control, improving manufacturing yield and etalon performance.