Fiber-Optic Ozone Concentration Sensing With Integrated Photoelectric Sensor
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Solution Overview
Problem
Conventional ozone concentration measurement devices suffer from low accuracy due to temperature differences between the light source and receiver components, electrical wiring noise, and a complex, large-sized configuration, which affects the stability and precision of ozone concentration measurements.
Innovation Solution
An ozone concentration measurement device with a photoelectric sensor having an integrated light emission and reception section, connected via optical fibers to a container, where the light is introduced and received, and a calculation section calculates the ozone concentration based on light reception signals, eliminating the need for separate electrical wiring and reducing device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visible light source and light receiving element are placed at locations away from each other by at least the optical path length, then ozone absorbance can be measured, but measurement accuracy becomes low due to temperature difference and electrical wiring noise
Solution Approach 1:
The patent integrates the light source and light receiving element into a single integrated sensor unit, eliminating the need for separate placement and long electrical wiring connections. This merging resolves the contradiction by maintaining measurement accuracy while improving reliability through reduced temperature differences and electrical interference.
Solution Approach 2:
The patent introduces an optical fiber as an intermediary to transmit light between the integrated sensor and the measurement chamber. This allows the light source and receiver to be physically close while still achieving the required optical path length, resolving the contradiction between measurement accuracy and stability.
2Measurement precision
If visible light source and light receiving element are placed on outer sides of light-transmitting windows with separate power supplies, then ozone absorbance measurement is enabled, but device complexity increases and size is increased
Solution Approach 1:
The patent combines the light source, light receiving element, and signal processing circuitry into a single integrated sensor module. This eliminates the need for separate power supplies and complex wiring arrangements, thereby reducing device complexity while maintaining measurement capability.
Solution Approach 2:
The integrated sensor unit performs multiple functions (light emission, light reception, signal processing) within a single component, reducing the overall number of components needed and simplifying the device configuration while maintaining full measurement functionality.
3Measurement precision
If optical path length is set at several cm to several tens of cm, then ozone absorbance measurement is possible, but device size is increased
Solution Approach 1:
The patent uses optical fibers to guide light through a long path length in a compact, flexible configuration rather than requiring a long linear distance. This allows achieving several cm to tens of cm optical path length within a small device volume by utilizing the third dimension and flexible routing.
Solution Approach 2:
The patent nests the optical fiber within the device structure, allowing the light to travel through a long effective path length while the physical footprint remains compact. The optical fiber can be coiled or routed through available spaces, achieving long optical path in small volume.
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 device achieves high-accuracy ozone concentration measurements with a compact and simplified design, stable operation over a wide temperature range, and resistance to electromagnetic noise, while suppressing optical fiber deterioration.
Implementation Method 1
the absorbance of ozone is measured by a light receiving element placed opposite to the visible light source
Implementation Method 2
a light-emission optical fiber which is connected to the light emission section and introduces the light into the container; a light-reception optical fiber which leads out the light having passed through inside of the container, to the light reception section
Data Source
AI summary
An ozone concentration measurement device for measuring an ozone concentration of measurement target gas in a container includes: a photoelectric sensor in which a light emission circuitry for emitting light, a light reception circuitry for receiving the light, and a signal processing circuitry for transmitting a light emission signal to the light emission circuitry and receiving a light reception signal from the light reception circuitry, are integrally formed; a light-emission optical fiber which is connected to the light emission circuitry and introduces the light into the container; a light-reception optical fiber which leads out the light having passed through inside of the container, to the light reception circuitry; and a calculation circuitry which calculates the ozone concentration of the measurement target gas on the basis of the light reception signal from the signal processing circuitry.