fixed focus | An optical system for a camera or thermal imager that is set to one average distance, resulting |
| in an |
FPA | A rectangular |
array) | lenses and filters focus infrared energy to produce a thermal image. The type of FPA used in |
| the Thermal Imager is called a microbolometer. It produces signals that make a new complete |
| thermal image 60 times per second. |
focal point | The distance from the lens at which the thermal imager is in focus. |
focus distance | The closest distance at which you can focus the thermal image: 11.8 inches or 30 cm. |
focusing ring | The movable ring around the front lens that you adjust for the sharpest thermal image. This |
| has no effect on the visual digital camera image. |
frame rate | The number of times per second that the Thermal Imager displays a completely updated |
| thermal image: 60 times per second, or 60 Hz (Hertz). |
full scale | The minimum temperature and the maximum temperature that the Thermal Imager can |
| measure. When in AUTO RANGE mode, the Thermal Imager adjusts itself to a portion of full |
| scale, called “span” that is somewhere within the |
| settings, you can set the Thermal Imager to cover full scale, but usually this makes it more |
| difficult to discern small temperature variations in the thermal image. |
function key | The button on the directional keypad. Its function changes depending on what activity is |
| happening. It is often used as the ENTER key to confirm a menu selection. |
image | Either a thermal image or a visual image. The Thermal Imager captures both kinds every time |
| you pull the trigger. The pair of images are called an “image set.” When you save, erase, or |
| load an image to a PC, both the thermal and visual images always stay bundled together. |
M12 160x120 Thermal Imager Operator's Manual | 27 |
