Transmittance of Cyclohexane for IR Radiation Through Quartz Viewport

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Discussion Overview

The discussion centers on the transmittance of infrared (IR) radiation through liquid cyclohexane and a quartz viewport, specifically in the context of measuring the temperature of a graphite heater using a pyrometer. The focus includes the compatibility of the IR wavelengths with the properties of cyclohexane and the availability of relevant IR spectra.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about the ability of cyclohexane to transmit IR radiation in the 2-4 micron range through a quartz viewport to a pyrometer.
  • Another participant suggests comparing the expected wavelength with the IR spectra for cyclohexane, expressing uncertainty about any overlap.
  • A participant clarifies that their chamber is not closed and will condense vapors, while seeking IR curve data for cyclohexane in the range of 30000 to 60000 cm-1 wave number.
  • One participant provides links to resources for IR spectra of organic molecules, noting that finding the IR spectra is not difficult.
  • Another participant expresses doubt that the available IR spectra cover the specific range mentioned by the original poster.
  • A later reply concurs that none of the obtained IR curves include data in the 2-4 micron range.

Areas of Agreement / Disagreement

Participants express uncertainty regarding the transmittance of IR radiation through cyclohexane and the availability of relevant IR spectra. There is no consensus on whether the IR range of interest is covered by existing data.

Contextual Notes

Participants mention limitations in the available IR spectra and the specific wavelength range of interest, indicating potential gaps in data relevant to the discussion.

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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