INFRARED THERMOMETER WITH FIBER OPTIC REMOTE PICKUP AND METHOD

摘要

An infrared thermometer (10) fixed opening (99) has a distance to focus reading head (12) which allows transmission of infrared light (16) of a target (14) to a photosensor (52) a defocus detector head (20). Remote reading head has a club image lens (84) and a selective device for adjusting the sharpness of the lens (84) relative to the target (14) due to the fixed mounting of the playhead. The aperture setting is maintained stationary during the sharpness control to eliminate the need to recalibrate following the sharpness control. Head defocus detector (20) has a defocusing retransmission lens (50) which is selectively defocused to allow transmission of a slightly blurred image and defocused from the output end of an optical fiber cable (18 ) to the photosensor (52) to reduce noise, averaging of the signal light and reduce the calibration difficulties due to the high intensity tasks in the image field and to make the unit less susceptible to poor focusing . The accuracies is even more improved by the fact that a field stop is used (86) provided with a narrow slit, for example, allowing the passage of light only in specified areas of the end of input of the optical fiber cable (18) which constitutes the optical field.