초록 ▼

A hybrid focal plane array (FPA) structure including a Balanced Composite Structure (BCS) in which several layers of materials having differing thermal expansion coefficients stabilize the FPA during cryogenic cooling. An optical substrate with a layer of an optically sensitive material detects impi

A hybrid focal plane array (FPA) structure including a Balanced Composite Structure (BCS) in which several layers of materials having differing thermal expansion coefficients stabilize the FPA during cryogenic cooling. An optical substrate with a layer of an optically sensitive material detects impinging radiation. The optically sensitive material is coupled to a multiplexer (MUX) substrate via interconnection bumps. The MUX is bonded to a layer of a material having a high TEC. A rigid core layer is sandwiched between the MUX and a balancing layer formed of a material having similar mechanical and geometrical characteristics to the MUX substrate. The three-layer BCS consisting of the MUX, the rigid core layer and the balancing layer is designed to have an effective TEC matching that of the optical substrate. The bumps and the optically sensitive material are thus protected from undesirable stresses generated during thermal excursions, thereby resulting in substantially improved FPA reliability.

대표청구항 ▼

A hybrid Focal Plane Array (FPA) structure for detecting incoming radiation, comprising: a detector having an associated rate of contraction, the detector including an optically sensitive material for converting the incoming radiation to electrical charge, and an optical substrate for supporting the

A hybrid Focal Plane Array (FPA) structure for detecting incoming radiation, comprising: a detector having an associated rate of contraction, the detector including an optically sensitive material for converting the incoming radiation to electrical charge, and an optical substrate for supporting the optically sensitive material; a Balanced Composite Structure (BCS) coupled to the detector, the BCS including electronic means for receiving the electrical charge generated by the optically sensitive material from incoming radiation, a rigid core layer bonded to the electronic means, wherein the rigid core layer causes the electronic means to contract at the same rate as the detector upon cooling, and a balancing substrate bonded to the rigid core layer, such that the rigid core layer is sandwiched between the balancing substrate and the electronic means, thereby reducing distortion of the electronic means; interconnection means for mechanical, electrical, and thermal coupling of the BCS to the detector, such that the radiation detected by the detector is transmitted as electrical charge through the interconnection means to the electronic means; and cooling means for supporting the BCS, and for cooling the BCS and detector arrangement.