Accuracy of two dimensional interferometers

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In summary, the accuracy of interferometers for finding emitting direction in one direction is given by the equation Δθ = Δφ•λ/(2pi•l•cosθ). However, if two-dimensional accuracy is required, the combined angular error can be found by using a pair of crossed linear arrays. This information may not be readily available online.
  • #1
senmeis
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Hi,

the accuracy of interferometers for finding emitting direction in one direction is given as:

Δθ = Δφ•λ/(2pi•l•cosθ)

but what would it be if two dimensional accuracy is required, something like interferometer in crossing?

I thought this could be found somewhere in Internet, but I just don’t have luck.

Senmeis
 
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  • #2
I don't understand the physical setup and what you are trying to find.
 
  • #3
This angular error is only valid for one dimension. I wonder what is the combined angular error if two crossed inteferometers are used.

Senmeis
 
  • #4
Are you suggesting a two dimensional (rectangular) array or just a pair of crossed linear arrays?
 
  • #5
a pair of crossed linear arrays

Senmeis
 

FAQ: Accuracy of two dimensional interferometers

What is the principle behind two dimensional interferometers?

Two dimensional interferometers work on the principle of interference of light waves. They use two beams of light that travel different paths and then recombine to form an interference pattern, which can be used to measure the accuracy of the instrument.

How is the accuracy of a two dimensional interferometer calculated?

The accuracy of a two dimensional interferometer is calculated by measuring the difference between the actual position of a target object and the position indicated by the interference pattern. This difference is known as the measurement error and can be calculated using mathematical formulas.

What factors can affect the accuracy of a two dimensional interferometer?

The accuracy of a two dimensional interferometer can be affected by factors such as environmental conditions, vibrations, thermal expansion of the instrument, and imperfections in the optical components. These factors can introduce errors in the measurement and should be taken into account during calibration.

How can the accuracy of a two dimensional interferometer be improved?

The accuracy of a two dimensional interferometer can be improved by using high-quality optical components, ensuring proper calibration and alignment, minimizing environmental disturbances, and implementing advanced signal processing techniques. Regular maintenance and calibration checks can also help maintain the accuracy of the instrument.

What are the applications of two dimensional interferometers?

Two dimensional interferometers are widely used in precision measurement applications, such as in the semiconductor industry, optical metrology, and nanotechnology. They can also be used for surface profiling, flatness measurement, and displacement measurement in various scientific and industrial fields.

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