As dual band, 3rd generation FLIR systems progress from the research lab into the field, supporting technologies must also advance. This paper describes advances in Thermoelectric Thermal Reference Sources (TTRS) from single band (3 to 5 or 8 to 12 microns) to dual band in one assembly (3 to 5 and 8 to 12 microns). It will describe the optical, system, electrical, and mechanical parameters of dual band TTRS units. It provides IR system design engineers with the critical parameters of dual band TTRS units to aid in their design process.
TTRS assemblies provide a temperature controllable radiometrically uniform surface. When viewed by theFLIR system detectors, the TTRS enables the system electronics to perform gain and offset calibration as well as DC restoration for each pixel's preamp
Some of the parameters for 3rd Generation FLIR system TTRS units included in this paper will be:
Emissivity of BB surfaces.
Apparent thermal radiometric uniformity. How this is predicted and measured.
Window material wavelength transmission (Hermetically sealed units only).
TTRS emitter surface temperatures as a function of heat sink temperatures.
Trade-off between uniformity, power consumption, and transient performance.
Power consumption, Thermal interfaces and required heat sinking
Types and accuracy of Temperature sensors mounted on emitter surface.
Also included in this paper is a description of a Thermoelectric Black Body Test Apparatus that can be used to generate temperature coefficients needed to "burn" Proms for uncooled IRFPAs during their production and burn in processing.
The increasing use of the next generation focal plane array infrared detectors has resulted in growth in the number and types of Thermoelectric Thermal Reference Sources (TTRS). These TTRSs provide a temperature controllable, radiometrically uniform surface. When viewed by the system detectors, the TTRS allows the system electronics to perform gain and offset calibration as well as DC restoration.
This paper describes typical calibration cycles for starring arrays systems. It will include typical calibration temperatures for different ambients and transient times between these calibration points. For several size emitter surfaces, power consumption over the calibration cycle will be shown. Since starring array systems do not have mechanical scanners, other means are required to inject the TTRS image into the optical path. Methods for inserting the TTRS into the optical path will be discussed and examples shown. To aid infrared system design engineers during their design process, TTRS critical paramters for starring array systems will be discussed.
Recent changes in the infrared industry, specifically, the switch to next generation focal plane array infrared detectors, has increased the number and type of Thermoelectric Thermal Reference Sources (TTRS) in the market place. Until now little has been published to aid design engineers incorporating TTRSs into infrared systems. This paper will describe the optical, system, electrical, and mechanical parameters of TTRSs. It will provide infrared system design engineers with an overview of critical TTRS parameters as an aid during their design process.
The increasing use of the next generation focal plane array infrared detectors has resulted in a growth in the number and types of Thermoelectric Thermal Reference Sources (TTRS). These TTRSs provide a temperature controllable radiometrically uniform, high emissivity surface. When viewed by the system detectors, the TTRS allows the system electronics to perform gain and offset calibration as well as DC restoration. Until now little has been published to aid design engineers trying to incorporate TTRSs into infrared systems. This paper describes the optical, system, electrical, and mechanical parameters of TTRSs. It provides infrared system design engineers with an overview of the critical TTRS parameters as an aid during their design process. TTRSs for scanning and starring arrays are addressed as well as hermetically sealed versus unsealed units. Examples are provided of currently available TTRSs. A discussion of the advantages and disadvantages of hermetically sealed TTRSs as compared to unsealed units is included. The critical parameters of available TTRSs are also discussed.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.