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A2TPMI334IRAGXXOBC Datasheet(PDF) 11 Page - PerkinElmer Optoelectronics |
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A2TPMI334IRAGXXOBC Datasheet(HTML) 11 Page - PerkinElmer Optoelectronics |
11 / 21 page Datasheet A2TPMI Ô A2TPMI Datasheet Rev4 Page 11 of 21 Rev. Oct 2003 Application Information AMBIENT TEMPERATURE COMPENSATION Because of many physical effects, that influence the non-contact temperature measurement based on infrared radiation, it is difficult to meet the best initial adjustment for a specific application. Therefore some deviations might be found at first measuring. For all applications the optimized solution can be prepared and fixed based on the measurement in the application environment. PerkinElmer is pleased in providing you assistance to find the conditions, which deliver the highest accuracy in your application. The temperature compensation is only working well within a certain ambient temperature range, limited by different device parameters of the thermopile sensor and the temperature reference sensor. The following diagram shows a typical characteristics and is only an example for better understanding of the principle compensation curve. The curve shows the deviation for a correct working of a compensated module. Temperature Deviation of VTobj vs. Ambient Temperature -0,5 0 0,5 1 1,5 2 2,5 3 -20 0 20 40 60 80 100 Ambient Temperature [°C] The compensation of the module sample in the diagram is adjusted to the best fitting at 20°C to 80°C ambient temperature, but the curve can be shifted in the whole ambient temperature range through the change of A2TPMI parameters. MEASUREMENT TOLERANCE The temperature error of the A2TPMI depends on several factors like the emissivity, object temperature, object size to spot size relation, temperature gradients over the sensor housing in the environment, device tolerances and the optimal adjustment of the ambient temperature compensation. The accuracy as specified under VTamb and VTobj characteristics is based on theoretical calculation as well as on statistical evaluation results. The PerkinElmer quality system ensures that all A2TPMIs are calibrated and tested under a certain test conditions in order to guarantee these specifications. However, due to the nature of infrared remote temperature measurements there might occur limits ex- ceeding or deviations in specific application environments. In this case please contact the PerkinElmer application support to help you solving the problem. |
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