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How to measure hydroxyl radical concentration (airborne)?

Dear engineers and scientists,

 

Measuring and artificially producing hydroxyl radicals is relatively new research with great challenges due to short half life. I have asked this question on many forums to gather as much information as I can and my question is:

 

How can we measure hydroxyl radical concentration? I am only interested in airborne concentration, hydroxyls in water and cells are not relevant to my research.

 

Also there are few articles mentioned every time in these type of discussions and they are:

profilometer's picture

Profilometers using Low Coherence Interferometry used by NASA to measures thickness

Using a fiber-based optical profilometer NASA measures the thickness of liquid nitrogen in cryogenic chambers at its Propulsion Systems lab because these profilometers use fiber-based probes which can withstands the extreme environment, can be located hundreds of meters away from the interferometer and fit in the tight chamber which standard full-field profilometers with a human operator could not. The signal quality stays constant over the distance.

Materialise launches new Mimics® version: Mimics 13.1

Materialise launches new Mimics® version: Mimics 13.1

Mimics 13.1 focuses on new tools to improve measurements. 

Aman Haque's picture

Position Open: William E. Diefenderfer Chair in Mechanical Engineering at Penn State University

Dear Colleagues:

The Department of Mechanical and Nuclear Engineering at The Pennsylvania State University is seeking applicants for the William E. Diefenderfer Chair in Mechanical Engineering. Attached is a flyer for your information. Please let me know if you have any questions.

Sincerely

Aman Haque

Stress or strain: which one is more fundamental?

In between stress and strain, which one is the more fundamental physical quantity? Or is it the case that each is defined independent of the other and so nothing can be said about their order? Is this the case?

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