Prism Reflection Suppressor for Electromagnetic Wave Detection
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Solution Overview
Problem
Existing electromagnetic wave detection apparatuses face challenges in reducing surface reflection light caused by end surface reflection on the prism, which leads to ghosting and noise generation in the detector.
Innovation Solution
The apparatus incorporates a reflection suppressor on the prism's surface to minimize end surface reflection, ensuring that unnecessary light is not incident on the detector, thereby reducing noise and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a prism is used to guide electromagnetic waves to the detector, then the detection coverage and optical path control are improved, but surface reflection light from the end surface reaches the detector causing ghosting and noise
Solution Approach 1:
The patent applies an anti-reflection coating to the end surface of the prism, converting the harmful surface reflection light into beneficial effect by eliminating the reflection entirely. The coating creates a thin film that destructively interferes with reflected light waves, transforming the harmful reflection into minimal absorption, thereby allowing the prism to guide light efficiently without generating ghosting and noise in the detector.
2Object-affected harmful factors
If light-shielding means is arranged between the lens system and the prism to block reflected light, then ghosting is reduced, but the device complexity increases
Solution Approach 1:
The patent extracts the light-blocking function from a separate external component and integrates it directly into the prism structure through anti-reflection coating on the end surface. This eliminates the need for additional light-shielding means between the lens system and prism, reducing device complexity while maintaining the ability to block harmful reflected light.
Solution Approach 2:
The patent merges the light-shielding function with the prism itself by applying anti-reflection coating directly to the prism's end surface. This combination eliminates the need for separate light-shielding components, simplifying the overall device structure while effectively blocking surface reflection light that would otherwise reach the detector.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The implementation of the reflection suppressor effectively reduces unwanted light on the detector, minimizing ghosting and noise, and enhancing the overall performance of the electromagnetic wave detection system.
Implementation Method 1
surface reflection light caused by end surface reflection on the prism
Data Source
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AI summary
An electromagnetic wave detection apparatus 10 includes a first image forming unit 15 configured to form an image of incident electromagnetic waves, a prism 17 having a fourth surface s3 serving as a first emission surface for emitting electromagnetic waves incident from the first image forming unit 15, a progression unit 16 that includes a plurality of pixels px arranged along a reference surface ss and is configured to cause electromagnetic waves incident on the reference surface ss from a fourth surface s4 to progress in a particular direction using each of the pixels px, and a first detector 19 configured to detect electromagnetic waves progressing in the particular direction. The prism 17 includes a reflection suppressor 90 that is provided at a position out of a progression path of electromagnetic waves incident from the first image forming unit 15 to be detected by the first detector 19 and suppresses unnecessary light caused by end surface reflection of the prism 17 from being incident on the first detector 19.