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An ultrahigh-accuracy Miniature Dew Point Sensor based on an Integrated Photonics Platform
Jifang Tao1, Yu Luo2, Li Wang3
1Institute of Microelectronics, A*STAR (Agency for Science, Technology and Research), 11 Science Park Road 117685, Singapore.
Scientific Reports
|July 16, 2016
Summary
A new compact photonic dew point sensor (DPS) offers high accuracy and fast response. This innovative device overcomes the limitations of traditional chilled-mirror hygrometers, enabling on-chip dew point detection.
Area of Science:
- Photonics
- Metrology
- Sensor Technology
Background:
- Dew point measurement is critical for industrial and metrological applications.
- Conventional chilled-mirror hygrometers offer high accuracy but are costly, bulky, and slow.
Purpose of the Study:
- To develop a compact, integrated photonic dew point sensor (DPS).
- To overcome the limitations of existing dew point measurement technologies.
Main Methods:
- Utilized a partially exposed photonic micro-ring resonator.
- Leveraged evanescent fields for water droplet sensing.
- Employed the thermo-optic effect (TOE) for in situ temperature sensing.
Main Results:
- Demonstrated a compact DPS with high accuracy and fast response.
- The photonic sensor simultaneously detects condensed water and measures temperature.
- Eliminated most temperature-related errors common in chilled-mirror hygrometers.
Conclusions:
- The novel photonic dew point sensor outperforms conventional methods in size, cost, and response time.
- Paves the way for on-chip dew point detection.
- Enables applications previously unsuitable for traditional hygrometers due to constraints.
