Viewing posts for the category Ultrasensitive Instrument Design

Technology: Low Noise Thermoelectric Cooler (TEC) Controllers

Thermoelectric (Peltier) Coolers

A thermoelectric cooler is a solid-state device made from two alumina ceramic plates with an array of metallized pillars in between.  The pillars are also ceramic--they're made of alternating p-type and n-type bismuth telluride (Bi2Te) semiconductors, alloyed with antimony telluride (p-type) or bismuth selenide (n-type), and connected in series electrically.  The Peltier effect makes them electric-powered solid state heat pumps.   (Thermocouples work the other way round, via the Seebeck effect, but the physics is the same.)

How We Work

At EOI, we've been building advanced instruments for a long time. One reason for our success is our large inventory of working designs, and another is the way we go about doing it. This post walks through a typical sort of development plan for a challenging customer requirement, in the form of a hypothetical email proposal outline for a fibre-coupled noninvasive glucose sensor similar to the one we did in 2013.
(You can also read about a recent project that went a lot like this, except with a single prototype stage.)

Silicon Photomultiplier (SiPM, MPPC) System for Cathodoluminescence

In How We Work, we gave an overview of how we build instruments, from the initial feasibility calculation (or photon budget) to delivery of the first production units.

Noninvasive Transcutaneous Blood Glucose: A War Story

Here at EOI we have three main kinds of project. One is our internal technology development projects. Some of these fail, mostly because they tend to be insanely hard, but the ones that pay off give us important new capabilities.

Touch Panel Displays: Low-Cost Optical Front End

In cooperation with Flatfrog Laboratories AB, Lund, Sweden. This one was interesting mostly due to the requirement for high and stable performance at an absolute rock-bottom cost.