Abstract: A scanning radiation sensor (10) automatically focuses a focusable optical system (26) based on the closest distance (C) and the farthest distance (F) of the optical system (26) from a target (12) through means of a focusing controller (44), motor driver (42) and focus motor (40) to obtain an optimum focus for all points along a line between the farthest point (f) and closest point (c).

Abstract: A solid state laser visible light source (26) passes light through a scanning mechanism (22) otherwise used to convey radiation from a target (12) to a detector (28) of a scanning radiation sensor (10) to mark with light a line (16) which is continuous when the sensor (10) is operating in a continuous mode, but when the sensor is operated in a spot mode in which a plurality of spots along a scan line are to be individually measured, a control (30) causes the light source to turn on and off at the correct times in the scan cycle to cause the light source (26) to mark the plural spots on the scan line (16). A CCD camera (40) with an automatic gain control circuit (46) is used in conjunction with a band pass light filter (36) to substantially enhance viewability of the image of the light markings (16) on the target (12) on a display (44).

Abstract: An across-the-stack gas analyzing spectrometer has a radiation source assembly including a cylindrical tube 22 having, in succession from its outer end toward the stack end a radiation emission assembly 28, a first lens assembly 30, and an AOTF assembly, all in optically aligned arrangement because of the circular perimeter of the elements in the circular tube, the arrangement also including a projecting second lens nozzle 98 received in an air window assembly 104 which forms a venturi with the second lens, the air window having a ball joint arrangement 120 for easy alignment of the directed beam, and also including a small diameter air window tube 142 through which clean air is directed into the stack through a larger diameter stack opening.

Abstract: A detector assembly of a spectrometer device which includes a built-in test gas chamber, has a housing defining a chamber with a first end having a first aperture and a second end having a second aperture opposite the first aperture. While light transmissive windows can be mounted in the opposed apertures to enclose the chamber, it is preferred that a focusing lens be mounted in the first aperture and a detector in the second aperture in order to enclose the housing ends and define the chamber. The chamber has a cone-like inner surface tapering from the first aperture to the second aperture. The housing has a test gas inlet in communication with the chamber and disposed proximate the first end thereof. A test gas outlet is in communication with the chamber and disposed proximate the second end. The test gas inlet is so oriented as to introduce test gas into the chamber on a tangent to the first end, first aperture resulting in a tangential flow path direction within the cone-like chamber.