Fresnel zones
E125099
Fresnel zones are concentric regions on a wavefront used in wave optics to analyze and predict diffraction and interference effects, especially in near-field conditions.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Fresnel zone construction | 1 |
| Fresnel zones canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1080741 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Fresnel zones Context triple: [Fresnel diffraction theory, explains, Fresnel zones]
-
A.
Fresnel zone plates
Fresnel zone plates are diffractive optical elements composed of concentric rings that focus light through interference rather than refraction, serving as lens alternatives in applications like X-ray and microscopy.
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B.
Fresnel diffraction theory
Fresnel diffraction theory is a wave-optics framework that describes how light diffracts when source or observation distances are finite, using near-field approximations derived from the Huygens–Fresnel principle.
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C.
Fraunhofer diffraction
Fraunhofer diffraction is the far-field diffraction pattern of waves, typically light, observed when both the source and observation screen are effectively at infinite distance or made so with lenses, producing characteristic interference patterns.
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D.
Hertzian waves
Hertzian waves are early experimentally demonstrated electromagnetic waves that confirmed James Clerk Maxwell’s theory of electromagnetism and paved the way for modern radio communication.
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E.
Huygens–Fresnel principle
The Huygens–Fresnel principle is a fundamental concept in wave optics that explains how every point on a wavefront acts as a source of secondary wavelets whose interference determines the wave’s subsequent propagation and diffraction.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Fresnel zones Target entity description: Fresnel zones are concentric regions on a wavefront used in wave optics to analyze and predict diffraction and interference effects, especially in near-field conditions.
-
A.
Fresnel zone plates
Fresnel zone plates are diffractive optical elements composed of concentric rings that focus light through interference rather than refraction, serving as lens alternatives in applications like X-ray and microscopy.
-
B.
Fresnel diffraction theory
Fresnel diffraction theory is a wave-optics framework that describes how light diffracts when source or observation distances are finite, using near-field approximations derived from the Huygens–Fresnel principle.
-
C.
Fraunhofer diffraction
Fraunhofer diffraction is the far-field diffraction pattern of waves, typically light, observed when both the source and observation screen are effectively at infinite distance or made so with lenses, producing characteristic interference patterns.
-
D.
Hertzian waves
Hertzian waves are early experimentally demonstrated electromagnetic waves that confirmed James Clerk Maxwell’s theory of electromagnetism and paved the way for modern radio communication.
-
E.
Huygens–Fresnel principle
The Huygens–Fresnel principle is a fundamental concept in wave optics that explains how every point on a wavefront acts as a source of secondary wavelets whose interference determines the wave’s subsequent propagation and diffraction.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
diffraction analysis method
ⓘ
interference analysis tool ⓘ wave optics concept ⓘ |
| appliesTo |
cylindrical wavefronts
ⓘ
near-field conditions ⓘ spherical wavefronts ⓘ |
| assumes |
linear superposition of secondary wavelets
ⓘ
scalar wave approximation ⓘ |
| basedOn | Huygens–Fresnel principle ⓘ |
| category |
Electromagnetic wave propagation
ⓘ
Optics ⓘ |
| characteristic |
alternating constructive and destructive contributions
ⓘ
concentric regions on a wavefront ⓘ |
| contrastedWith | Fraunhofer diffraction ⓘ |
| dependsOn |
distance between source and observation point
ⓘ
geometry of propagation path ⓘ wavelength ⓘ |
| field |
physical optics
ⓘ
wave optics ⓘ |
| firstZoneContribution | dominant in received field ⓘ |
| hasPart |
first Fresnel zone
ⓘ
higher-order Fresnel zones ⓘ second Fresnel zone ⓘ |
| higherZonesContribution | partially cancel each other ⓘ |
| importance |
determining clearance requirements for line-of-sight links
ⓘ
estimating diffraction loss over obstacles ⓘ |
| mathematicalFormulation | division of wavefront into annular regions of equal path difference ⓘ |
| namedAfter | Augustin-Jean Fresnel ⓘ |
| pathDifferenceBetweenAdjacentZones | lambda_over_2 ⓘ |
| relatedConcept |
Fresnel radius
ⓘ
Fresnel volume ⓘ |
| relatedTo |
Fresnel diffraction theory
ⓘ
surface form:
Fresnel diffraction
Fresnel integrals ⓘ Huygens–Fresnel principle ⓘ
surface form:
Huygens principle
zone plate ⓘ |
| usedFor |
analyzing diffraction
ⓘ
analyzing interference ⓘ antenna placement optimization ⓘ approximating wave propagation ⓘ microwave link design ⓘ optical system design ⓘ predicting near-field diffraction patterns ⓘ radio link planning ⓘ |
| usedIn |
acoustics
ⓘ
radar system design ⓘ satellite communication link analysis ⓘ seismology wave analysis ⓘ wireless communications engineering ⓘ |
| visualizedAs | elliptical cross-sections along a propagation path ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Fresnel zones Description of subject: Fresnel zones are concentric regions on a wavefront used in wave optics to analyze and predict diffraction and interference effects, especially in near-field conditions.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Fresnel zone construction