Infrared screening and inspection system

G - Physics – 01 – N

Patent

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Details

G01N 25/72 (2006.01) G01J 5/10 (2006.01) G01N 21/84 (2006.01) G01R 31/04 (2006.01) G01R 31/309 (2006.01)

Patent

CA 2282663

In general, the spatial resolution and repeatability of results using infrared detectors for examining printed circuit cards has been so poor that the devices have failed to achieve commercial success. These problems are overcome by a system including an isothermal enclosure (1) for receiving a card (33) to be tested, an infrared camera (94) in the chamber (32) defined by the enclosure (1), sensors (109, 110) for monitoring the temperature of the card (33) and ambient temperature conditions in the chamber (32) to derive signals indicative of the temperatures, and a computer (96) connected to the camera (94) and to the sensors (109, 110) for examining all signals to produce a three-dimensional image of the sample (33), variations in the image from sample to sample being indicative of an anomaly in a sample.

De manière générale, la résolution spatiale et la reproductibilité des résultats obtenus par les détecteurs à infrarouges dans l'examen des cartes à circuit imprimé ont été si mauvais que ces dispositifs n'ont pas obtenu un succès commercial. Ces problèmes sont résolus par un système comprenant un boîtier isotherme (1) permettant de recevoir une carte (33) à tester; une caméra à infrarouges (94) disposée dans la chambre (32) définie par le boîtier (1); des capteurs (109, 110) permettant de contrôler la température de la carte (33) et les conditions de température ambiantes dans la chambre (32), de façon à dériver des signaux indiquant lesdites températures; et un ordinateur (96) connecté à la caméra (94) et aux capteurs (109, 110), qui examine tous les signaux de façon à produire une image tridimensionnelle de l'échantillon (33), les variations de l'image d'un échantillon à l'autre indiquant une anomalie dudit échantillon.

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