| 摘要 |
An infra-red measurement device is disclosed having at least two laser emitters (2) which between them define a sighting area (7,7',7"). In one embodiment of the invention, two lasers are provided and these are each preferably split into a number of beams by means of, for example, a diffraction grating lens (4). The fact that there are two laser emitting devices, means that effectively twice the power can be utilised since the limit is pe r laser emitting device, and thus twice the brightness of a conventional device attained. In another embodiment of the invention, four laser emitters (2) are employed and the beams (6) can be split by a diffraction grating as before. The laser emitters in the device c an be operated simultaneously, sequentially, or can be pulsed. Having greater brightness th an conventional devices, the detectors of the invention are excellent for use in dark or smo ky conditions, for example for obtaining the temperatures of car engines, furnaces and the like ,
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