Light Assembly Integrated Test Facility for Optical Flux Monitoring

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Solution Overview

Problem

The quantity of light flux through the light output aperture of light assemblies can fluctuate due to changes in light source properties and optical properties, making it difficult to accurately assess the optical properties, and can lead to catastrophic failures due to dust, ice, or mechanical damage, which are not easily detected.

Innovation Solution

A light assembly with an integrated test facility that includes an optically isolated photo detector and an optical waveguide to measure the light flux, allowing for real-time monitoring of the light source and cover conditions, using a method that involves measuring scattered light before and after turning off the electromagnetic radiation source to isolate ambient and forward light components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If visual checking of the light assembly optical properties is performed, then the light beam geometry and intensity can be assessed, but the checking is difficult to obtain and often inaccurate

Engineering Contradiction:
Improvelight beam geometry and intensity measurement accuracyVSAvoiddifficulty of visual checking
Core Design Contradiction:
Measurement precisionVSEase of operation

Solution Approach 1:

The patent introduces an optical waveguide as an intermediary component that transports light from the light source to a photodetector. This waveguide acts as a mediator between the light source and the detection system, enabling accurate measurement of light properties without requiring direct visual inspection. The waveguide converts the light path into a measurable signal that can be processed electronically, thereby improving measurement accuracy while maintaining ease of operation.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Reliability

If remote test equipment with photo detectors is used to check light assembly intensity, then the intensity and direction can be monitored, but the equipment complexity increases

Engineering Contradiction:
Improvelight flux monitoring capabilityVSAvoidremote test equipment complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the test facility directly into the light assembly by integrating the photodetector and optical waveguide within the same housing. This combination eliminates the need for separate remote test equipment, reducing overall system complexity while maintaining reliable light flux monitoring. The integration allows the light assembly to self-diagnose its optical properties, combining the functions of light generation and light measurement in a single unified system.

Inventive Principle:
Principle #5Merging (Combining)

3Measurement precision

If the photo detector is positioned to directly receive light from the source, then the measurement is simple, but the photo detector cannot be optically isolated from the electromagnetic radiation source

Engineering Contradiction:
Improvelight flux measurement accuracyVSAvoidoptical isolation arrangement
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The optical waveguide serves as an intermediary that enables the photodetector to receive light from the source while maintaining optical isolation. The waveguide transports light through its internal structure, allowing the photodetector to be positioned away from the direct light path while still receiving the light signal for measurement. This resolves the contradiction by providing both measurement capability and optical isolation through the mediating waveguide structure.

Inventive Principle:
Principle #24Intermediary (Mediator)

4Adaptability or versatility

If the light assembly operates in dynamically changing ambient light conditions, then the light assembly can function in various environments, but the light flux measurement becomes compromised

Engineering Contradiction:
Improveoperation in varying ambient lightVSAvoidlight flux measurement accuracy
Core Design Contradiction:
Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The optical waveguide acts as a selective intermediary that allows only the light from the light source to reach the photodetector, while blocking ambient light from interfering with the measurement. The waveguide's optical properties enable it to guide the source light to the detector while excluding external light sources, thereby maintaining measurement precision even when the light assembly operates in environments with dynamically changing ambient light conditions.

Inventive Principle:
Principle #24Intermediary (Mediator)

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

Enables continuous, real-time diagnosis of light source degradation and cover conditions, providing early detection of damage or dirtiness, thus preventing failures and ensuring reliable operation.

Implementation Method 1

the light pipe is configured as a solid transparent structure that contains the electromagnetic radiation by total internal reflection

Methodology Applied
Scientific EffectTotal internal reflection: Total Internal Reflection

Implementation Method 2

at least one photo detector, optically isolated from the at least one electromagnetic radiation source, the at least one photo detector being configured to receive electromagnetic radiation conveyed by the cover

Methodology Applied
Scientific EffectPhotoelectric effect: Photoelectric Effect

Data Source

PatentUS10078008B2Light assembly with integrated test facility
Publication Date: 2018.09.18 OXLEY DEV
  • US10078008B2 patent drawing
  • US10078008B2 patent drawing
  • US10078008B2 patent drawing

AI summary

A light assembly, comprising: a base; at least one electromagnetic radiation source mounted on the base; a cover located over the base, the cover being transparent to the electromagnetic radiation produced by the electromagnetic radiation source; and at least one photo detector, optically Isolated from the at least one electromagnetic radiation source, the at least one photo detector being configured to receive electromagnetic radiation conveyed by the cover.