Transmittance of Cyclohexane for IR Radiation Through Quartz Viewport

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SUMMARY

The discussion centers on the transmission of infrared (IR) radiation through liquid cyclohexane using a pyrometer to measure the temperature of a graphite heater at temperatures up to 1200°C. The pyrometer operates within a wavelength range of 2 to 4 microns. Participants emphasize the need to compare the IR spectra of cyclohexane with the pyrometer's sensitivity range, noting that existing databases do not provide relevant IR curves for cyclohexane in this specific range. Additionally, concerns regarding the boiling point of cyclohexane at approximately 80°C and the need for a pressure-proof chamber are highlighted.

PREREQUISITES
  • Understanding of infrared spectroscopy and its applications.
  • Knowledge of pyrometry and temperature measurement techniques.
  • Familiarity with the properties of cyclohexane, including its boiling point.
  • Experience with quartz materials and their optical properties in IR applications.
NEXT STEPS
  • Research the IR spectra of cyclohexane using databases such as the AIST Spectral Database.
  • Investigate the thermal properties and behavior of cyclohexane at elevated temperatures.
  • Learn about the design and construction of pressure-proof chambers for high-temperature applications.
  • Explore alternative pyrometric techniques or sensors that may operate effectively in the desired wavelength range.
USEFUL FOR

Researchers, chemists, and engineers involved in high-temperature measurements, particularly those working with organic solvents and infrared spectroscopy applications.

Jhon Paul
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I am interested to use a pyrometer to measure the temperature of a graphite heater while it is being heated (upto 1200 degC). The heater is located inside a small chamber filled with liquid cyclohexane . For viewing purpose of the pyrometer the chamber is having a viewport of Quartz.

The pyrometer can sense wavelength in the range 2 - 4 micron. I am interested to know whether cyclohexane will transmit the IR radiation to pass through the quartz viewport upto the pyrometer. Will appreciate a reply in this regard.
 
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Jhon Paul said:
(upto 1200 degC). The heater is located inside a small chamber filled with liquid cyclohexane

Can't help with IR (I would start finding the expected wavelength and comparing it with the IR spectra for cyclohexane, no idea if the ranges will overlap though) but I hope your chamber is pressure proof, cyclohexane boils around 80°C.
 
Thanks for your reply. The vessel is not closed and the vapours once formed will be condensed using a separate condenser. In fact I was trying to find IR curve for cyclohexane in the range of 30000 to 60000 cm-1 wave number. Unfortunately i could not get one . If you find any IR curve in that range please do communicate.
 
Finding the IR spectra is not that difficult. Problem is, I don't think these cover the IR range OP mentioned, so they are useless here.
 
I agree with you. The IR curve I have obtained none of them spells anything in that region of 2-4 microns.
 

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