In order to overcome bonding and packaging problems associated with two dimensional arrays of large numbers of elements, a pyroelectric/CCD hybrid is being developed. The device consists of a 256 element two dimensional pyroelectric array directly bonded to a custom CCD. The monolithic pyroelectric array is made of a modified lead zirconate ceramic with element size 216μm square on a 256μm pitch. The CCD incorporates sixteen rows of sixteen element analogue multiplexers. Direct charge injection into the CCD channel is achieved via an array of pads on the top of the CCD which are bonded directly to the pyroelectric, currently with an array of screen printed epoxy resin dots. A solder bonding technique is preferred, but is still under development. The detector array is intended to be used with a mechanical chopper operating at approximately 50Hz frame rate. Devices are tested in a compact camera and display system. Prototype devices have been made with more than 200 working elements and NETD measurements on single elements give results between 1°C and 2°C. The theoretically predicted value is 0.8°C.
John E. Loveluck,
Stephen G. Porter,
"A Charge Coupled (CCD) Pyroelectric Array", Proc. SPIE 0395, Advanced Infrared Sensor Technology, (30 November 1983); doi: 10.1117/12.935186; https://doi.org/10.1117/12.935186