While out for a walk in my neighborhood, I caught a whiff of something that instantly made me think of my grandmother’s house. I haven’t experienced that smell—either from its original source or elsewhere—in well over a decade, but the memory of being back at my grandmother’s house was immediate and striking. On the other hand, I can’t really remember or recreate that smell in my mind; either it’s there or it isn’t. I have convenient analog and digital methods of recording images and sounds so that I can see and hear them later, but no way to capture the scent of a dish at a restaurant, a favorite vacation spot, or any other smell that moves me in some way.
I don’t normally think of smelling as being something within the province of machines. I understand, of course, that devices like smoke detectors and breathalyzers perform what amounts to mechanical olfaction of sorts, but I was still sort of surprised to learn that increasingly sophisticated artificial noses are being incorporated into robots and other devices. What intrigues me more than anything is how such sensors might work. How does one go about measuring and quantifying something as broad and seemingly subjective as smell? [Article Continues…]