![]() ![]() The sources of measurement noise-for example, vibration and sound energy-can be identified, and countermeasures can be put in place to minimize their effects on the measurement process. Noise in the measurement process is any difference in the data that is not directly attributable to the surface or system being measured. Changes can be the result of vibration, acoustic noise, air turbulence, temperature, and humidity.Īny change in the test environment can cause noise in the measurement. Interferometer systems are very sensitive to changes in the test environment. Understanding the measurement process entails more than just an understanding of how the interferometer system works-it also requires knowledge of what can affect the accuracy and the repeatability of the measurement. ![]() In order to maximize the measurement capabilities of an interferometer system, it is important to have a good understanding of the measurement process, as well as a familiarity with the materials and design of the surfaces and systems to be tested. Their "push-button" ease of use may actually be a shortcoming in the operator`s ability to obtain accurate measurements in a given test situation. Interferometers are generally easy-to-use instruments for measuring the surface figure of optical elements and the transmitted wavefront performance of optical systems. ![]()
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