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In order to carry out a quantitative analysis of thermographic data the heating energy and its spatial distribution have to be known. Especially in the case of flash lamp excitation the correct determination of these parameters is complicated due to very short excitation times combined with high power densities. The paper describes a procedure for the characterization of such lamps using a simple calorimetric sensor and a plane reference area. The presented results illustrate the performance and the suitability of the method in the field of thermography. The used simple concept to determine spatial energy distribution includes a large size flat test area for relative measurements and a small size energy sensor to obtain an absolute value (2). This absolute value allows the shift of the relative distribution along the energy axis to the correct scale. Both components will be read out simultaneously using an infrared camera, which is already present for thermography investigations. The realization of a large size energy monitor was carried out in such a way, that a black paperboard (98 cm x 70 cm area, 0.4 mm thick) was clamped at the top edge. So, the whole paperboard hung down freely. In order to measure the energy of a flash persisting only few milliseconds, a fast sensor with wide-band absorption coating and energy calibration has to be used (3). But, correctly calibrated energy values can be obtained merely in the case of parallel light beams with an aperture smaller than the sensor area. Otherwise, the window at the sensor housing acts as an aperture influencing the angular distribution of the incoming light. Therefore, in order to obtain a proper energy value inside an arbitrary light radiation field a sensor is required with no aperture at all. Therefore, an aperture-less sensor was realized as a calorimeter: a small metal plate of precisely defined shape with known thermal properties and black coating should be exhibit a certain temperature rise after UV-, VIS- or IR-

Determination of the spatial energy distribution generated by means of a flash lamp