Hi How can we evaluate the effect of heat on the Photonic Crystal Sensor output?
Does the output of the photonic structure change with heat?
Are there any equations in this area?
Dear masoud
The temperature sensor working principles based on therm optical effect.From the equation u can increase temperature and corresponding material refractive index changed.Pls refor my paper
Dear Rajasekar
Whether the ratio of wavelength shifts to temperature changes is defined as sensitivity??
the heat can affects on the output of the photonic crystal sensor by two mechanisms:
1- the thermal expansion coefficient, where as the temperature changes the dimensions (geometrical , rod or hole radius and the lattice constant) of the PhC also changes depending on whether the coefficient is PTC or NTC.
2- the second mechanism is the refractive index temperature dependent ( refractive index of PhC materials varies with temperature) and also, for the analyte.
so, you can evalute the effect of heat by take into account these two parameters.if you want thermally stable PhC sensor you must use very low thermal expansion coefficient and very low RI changes with temperature for the materials of the PhC and the analyte.
if there is a thermal response of your sensor there are two sensitivities:
1- dlamda/dn in nm/RIU.
2- dlamda/dtemperature in nm/ Celsius degree.
Sir Mahmoud S Soliman please I have some questions:
1-What is meaning all (PTC or NTC)?
2-How we can calculate "Amplitude Sensitivity"?
3-Analyte layer did mean background of PCF?
Thank's
Dear Jamal Nasir Jabir
1- PTC means positive temperature coefficient ( as the temperature increases, the dimensions increases or expands) and NTC means negative temperature coefficient ( as the teperature increases, the dimensions decreases).
2- what do you mean by aplitude sensitivity?
3- the analyte means the material that you use it for sensing, for example we can infiltrate some holes of PCF with a material that their refractive index changes with environmental humidity to sense the humidity by using the reduction in the transmission as a function of the humidity.
you are welcome
the amplitude sensitivity was calculated for PCF using the propagation lossof the guided core mode as a function of wavelength and the analyte refractive index.
amplitude sensitivity= (d propagation loss/d RI of analyte) / propagation loss in units of RIU^-1
I think that equation 4 in the introduced article by Dr. Rajasekar is a suitable response.
- Badges
- Science topic
- Similar topics
- Methodology
- Sensors