Patent ID: 7482576

Claim:
A sensor apparatus for measuring optical radiation from within a process chamber, the process chamber being configured for processing workpieces with a process that involves optical radiation, the sensor apparatus comprising: a substantially planar window, the window being substantially transparent to the optical radiation; at least one sensor for measuring the optical radiation, the at least one sensor having an electrical conductivity response to exposure to the optical radiation, the at least one sensor having a dark resistance of no more than about 2 mega-ohms and a fully illuminated resistance of no less than about 10,000 ohms; electrical conductors forming electrical connections for the at least one sensor; a base joined with the window so as to substantially encapsulate the at least one sensor and the electrical conductors therebetween; and a controller electrically connected with the electrical conductors whereby the controller is configured to send and receive electrical signals via the electrical conductors, the controller being supported by the base.