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$Interference and Diffraction$ 02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.

Interference: Path Lengths

Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...

Interference and Superposition of Waves

Interference and Superposition of Waves

When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...

Atomic Emission Spectroscopy: Interference

Atomic Emission Spectroscopy: Interference

In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...

Atomic Absorption Spectroscopy: Interference

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...

Sound Waves: Interference

Sound Waves: Interference

Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...

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Drift in interference filters. 2: radiation effects.

|February 6, 2010

Summary

Narrow-band interference filters exhibit radiation-induced transmission drift toward shorter wavelengths. For ZnS-cryolite filters, this drift is most sensitive to radiation around 3900 Å, with a rate of 3 Å/100h.

Area of Science:

Optical Engineering
Materials Science

Background:

Narrow-band interference filters are crucial optical components.
Peak transmission drift, particularly toward shorter wavelengths, is a known phenomenon.
Two primary mechanisms for drift have been identified: thermal history and radiation exposure.

Purpose of the Study:

To investigate the radiation-dependent mechanism of peak transmission drift in ZnS-cryolite filters.
To experimentally determine the spectral sensitivity and drift rate of these filters under solar imaging conditions.
To validate a model explaining radiation-induced drift based on changes in optical thickness.

Main Methods:

Experimental testing of ZnS-cryolite filters with a specific design: [(HL)(4)H(8)(LH)(4)L](3)L(-1).
Exposure of filters to a simulated solar image in the focal plane of an f/20 system.

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Measurement of peak transmission drift rates over time.

Model calculations to correlate observed drift with absorbed radiant energy.

Main Results:

ZnS-cryolite filters demonstrate significant sensitivity to radiation exposure.
The filters are most sensitive to radiation within a 100 Å band centered at approximately 3900 Å.
A drift rate of approximately 3 Å per 100 hours of exposure was measured under f/20 solar imaging conditions.

Conclusions:

Radiation exposure is a significant factor causing peak transmission drift in ZnS-cryolite filters.
The observed drift is consistent with a decrease in the optical thickness of ZnS proportional to absorbed radiant energy.
Understanding this radiation-induced drift is critical for the long-term stability and performance of interference filters in optical systems.