| 摘要 |
<p>A sensor unit is used comprising two pyrometers arranged in respective chambers disposed side-by-side and open at one end. One chamber is substantially totally reflecting and the other is substantially totally absorbing. Periodically, the unit is advanced to the immediate proximity of the product, the signals from the pyrometers are received after the response time of the pyrometers has elapsed, and then the unit is withdrawn to its initial position. The signals from the pyrometers are processed so as to provide a signal representing the emissivity of the product.</p> |
