| 摘要 |
An optical module (20) includes a transparent substrate (30) and a refractive optical element (42) mounted on the substrate. A conductive heating trace (60) is deposited on the substrate around the refractive optical element. A temperature sensor (62) senses a temperature of the substrate. Control circuitry (50, 51, 53) is coupled to the temperature sensor so as to measure a difference between the temperature of the substrate and a target operating temperature of the module, and to drive a current through the conductive heating trace, responsively to the difference, so as to heat the substrate to the target operating temperature. |
