Infrared Reflector Reflectance Monitoring for Fogging Detection
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Solution Overview
Problem
Existing drying apparatuses for inkjet methods face challenges in efficiently detecting and addressing fogging on metal reflectors due to oxidation or sulfurization, which reduces reflectance and can damage the reflector.
Innovation Solution
A drying apparatus that includes an infrared heater, a reflector with a measuring system comprising a light emitting part and a light receiving part, which measures reflectance at multiple points on the reflector's surface to detect any decrease in reflectance caused by fogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is provided in a place where infrared rays are always irradiated to detect reflectance, then reflectance can be detected, but the sensor may be damaged by heat
Solution Approach 1:
The measurement part measures reflectance before the infrared heater is activated. By performing the measurement in advance when the reflector surface temperature is low, the sensor is protected from thermal damage while still obtaining the necessary reflectance data for controlling the heating process
Solution Approach 2:
The system alternates between measurement mode (with infrared heater off) and heating mode (with infrared heater on). This periodic switching allows the sensor to operate in cool conditions during measurement while the reflector is heated during the heating phase, resolving the conflict between measurement capability and sensor protection
2Measurement precision
If the entire area of the reflector is monitored for fogging detection, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The measurement part is designed to measure reflectance across the entire width of the reflector by positioning the light emitting and light receiving parts to scan or cover the full reflective surface. This single measurement system performs the function of detecting fogging anywhere on the reflector without requiring multiple separate sensors, achieving comprehensive coverage with a unified device
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 solution allows for the efficient detection of reflectance changes across the entire reflector surface, enabling timely compensation for reduced heat transmission and preventing damage to the reflector.
Implementation Method 1
The measurement part includes a light emitting part and a light receiving part, and measures a reflectance at a plurality of places on the reflecting surface
Implementation Method 2
The reflector has a reflecting surface which reflects infrared rays
Implementation Method 3
a technique for applying heat to the conveyed sheet by infrared rays is known
Data Source
AI summary
A drying apparatus includes an infrared heater, a reflector, and a measurement part. The reflector has a reflecting surface which reflects infrared rays. The measurement part includes a light emitting part and a light receiving part, and measures a reflectance at a plurality of places on the reflecting surface.