Was I One Of The First To Have My Temperature Measured By A Thermometer Reading The Radiation From My Ear?
Last week, a doctor read my body temperature, by using an electronic thermometer, that read the temperature inside my ear.
But it wasn’t the first time!
That must have been in 1968 or 1969, when I was working at ICI in Runcorn.
ICI had a problem, in that they needed to read the temperature of chemical reaction vessels.
- Temperatures could be higher, than 1,000 °C.
- Some mixtures could be highly corrosive.
- Safety needed to be as high as possible.
My colleague; John Baxendale was assigned the problem.
John came up with a solution based on black bodies and their unique black body radiation.
These two paragraphs, from the Wikipedia entry for black body, explain the principle.
A black body or is an idealised physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. The radiation emitted by a black body in thermal equilibrium with its environment is called black-body radiation. The name “black body” is given because it absorbs all colours of light. In contrast, a white body is one with a “rough surface that reflects all incident rays completely and uniformly in all directions.”
A black body in thermal equilibrium (that is, at a constant temperature) emits electromagnetic black-body radiation. The radiation is emitted according to Planck’s law, meaning that it has a spectrum that is determined by the temperature alone, not by the body’s shape or composition.
Note, that I have very mildly edited, what Wikipedia says, to the King’s English.
John had developed some clever electronics, that read the spectrum of the radiation and by decoding the spectrum, he was able to calculate the temperature.
Early on in the testing, John found that nearly all of us, have two black bodies on the side of our heads; our ears, so he could measure the temperature inside them.
The Cure For White Coat Hypertension
At one of my previous GP practices the two excellent nurses had banned my GP from taking blood pressure as she always raised the patient’s blood pressure, by the way she took the pressure.
This page on a blog at the London Cadiovascular Clinic is entitled White Coat Hypertension, gives this definition.
White coat syndrome, also known as white coat hypertension is a phenomenon in which your blood pressure is artificially raised due to the stress of being in a clinic, hospital, or even just taking your own blood pressure. This usually happens due to the stress and anxiety associated with having medical investigations done. Your reading will be higher than it would be if you measured it at home.
A week ago, I had a message from my GP practice to come in and measure my blood pressure in their machine in the waiting room.
So I went in and took my blood pressure about an hour ago.
I just put my hand in the hole at the front, shook hands with the machine, pressed the green button on top and it inflated a glove around my hand and lower arm to take the pressure.
Ears Are A Black Body
When I worked for ICI in Runcorn in 1968, one of my colleagues; John Baxendale developed or acquired one of the first remote infra-red thermometers.
ICI needed one for taking the temperature of hot vessels , pipes and reactors on chemical plants and in laboratories. John’s thermometer solved the problem, by measuring the black body radiation of the object.
John found that to calibrate his instrument he could point it at a colleague’s ear. As the ears emit black body radiation, the device should have read 36.9°C, as it generally did.
These so-called tympanic thermometers are now in regular use and cost about twenty pounds.
John is one of those people that has stuck in my mind from all those years in the past. He was a surfer and probably the only one, I’ve ever met in my life. I remember some weekends, he used to take his Morris Minor Traveller all the way to the North of Scotland to go surfing. Visiting that area has been on my bucket list for years. The closest I got, was to fly in my Cessna 340A to the Orkneys.
How To Protect Your Property
I received this in an e-mail.
Several lives ago, one bloke kept having his car broken into, when parked in the University car park. Solution: put a few nuclear tri-foils over it (our University had a nuclear school). End of problem. Can’t think why.
You can get stickers here.
The Anonymous Widower 