Optical waveguide structure improvements of novel photonic dew point sensor
A dew point sensor based on integrated photonics provides a potential humidity measurement solution with higher measurement sensitivity, as well as being significantly smaller and faster than the current industry standard, the chilled mirror hygrometer. This thesis looks to understand and further...
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| Format: | Final Year Project |
| Language: | English |
| Published: |
2018
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/75289 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | A dew point sensor based on integrated photonics provides a potential humidity
measurement solution with higher measurement sensitivity, as well as being significantly
smaller and faster than the current industry standard, the chilled mirror hygrometer. This
thesis looks to understand and further develop this sensor by examining the photonics
structure design. It focuses on two areas and how they affect the sensor’s performance: the
shape of the photonics structure and the effects of the operating environment temperature.
The investigation into the photonics structure uses Lumerical MODE Solutions
simulations and finds that the structure should use a coupling gap of 300nm, should not
incorporate a coupling length and should consider using a one-sided design to combine the
input and output. The effect of high operating temperatures is considered by analysing
previously manufactured sensors’ performances under varying temperatures and
benchmarking the current maximum operating temperature as 117°C. It is apparent that
the cycling in higher temperatures causes shifts in the alignment with the optical fibres
when the sensor is packaged. |
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