Columnar Fiber Rod for Parallel Light in Photometric Sensors
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Solution Overview
Problem
Existing photometric apparatuses face reduced measurement precision when light is not incident as parallel light, leading to compromised spectral sensitivity characteristics and accuracy.
Innovation Solution
Incorporating a columnar fiber rod with a center axis perpendicular to the light receiving surface, along with a diffusion board and collimating optical elements, to ensure light is mixed and made parallel before entering the sensor, and optionally using a diaphragm plate to reduce stray light and IR cut-off filters to minimize infrared interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light is directly entered into the sensor without proper mixing and collimation, then the device complexity is reduced, but the measurement precision deteriorates due to oblique light entry
Solution Approach 1:
A fiber rod is introduced as an intermediary component between the light source and sensor. The fiber rod mixes and collimates light through total internal reflection, transforming divergent light into parallel light without requiring complex external optical systems. This mediator resolves the contradiction by improving measurement precision while keeping the overall device structure relatively simple.
Solution Approach 2:
The patent replaces complex mechanical optical systems (multiple lenses and mirrors for mixing and collimation) with a passive fiber rod that achieves the same light conditioning function through optical physics principles. This substitution maintains measurement precision while reducing mechanical complexity.
2Measurement precision
If a fiber rod is introduced to mix and collimate light, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The fiber rod serves multiple functions simultaneously: it mixes light, collimates light, and guides light to the sensor. This multi-functionality reduces the need for separate optical components, thereby improving measurement precision while minimizing the increase in device complexity.
Solution Approach 2:
The patent optimizes specific parameters of the fiber rod (length-to-diameter ratio of 5:1 or greater, specific numerical aperture) to achieve effective light mixing and collimation. By carefully controlling these parameters, the system achieves high measurement precision with a relatively simple and compact fiber rod structure.
3Measurement precision
If the fiber rod length is increased to improve light mixing, then the measurement precision is improved, but the device volume increases
Solution Approach 1:
The patent establishes an optimal parameter range for the fiber rod, specifically a length-to-diameter ratio of 5:1 or greater. This parameter optimization ensures sufficient light mixing and collimation for high measurement precision while preventing excessive fiber rod length that would increase device volume unnecessarily.
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
This configuration enhances the state of light incident to the sensor, improving measurement precision and accuracy by ensuring parallel light entry, thereby enhancing the photometric apparatus's performance.
Implementation Method 1
a columnar fiber rod in which a center axis is provided along a direction perpendicular to a light receiving surface of the photometric sensor is provided at a part of the optical system
Data Source
AI summary
This is to provide a photometric apparatus improved in measurement precision by improving the state of light incident to a sensor,which photometric apparatus 1 comprises a photometric sensor 30 into which light which is an object to be measured is incident, a signal processing means for processing a sensor output by the photometric sensor, and optical systems 50, 100, 92, 93 and 150 which introduces external light into the photometric sensor, wherein a columnar fiber rod 100 in which a center axis is provided along a direction perpendicular to a light receiving surface of the photometric sensor is provided at a part of the optical system.