Profile: Thomas Keating Ltd. designs and manufactures liquid helium cooled detector systems based on the indium antimonide hot electron bolometer. The InSb detector had previously been used to great effect as a heterodyne receiver for far infra-red (FIR) astronomy. We produce a long-established range of cryogenic detectors and associated components and instruments. These are used in diverse applications such as atmospheric remote sensing, astronomy, semi-conductor materials characterization, hot plasma fusion diagnostics, and electron spin resonance (ESR) spectroscopy. We are an ISO 9001 certified company.