| Autor: |
E.W. Reed, K.G. Keeping |
| Rok vydání: |
1979 |
| Předmět: |
|
| Zdroj: |
IFAC Proceedings Volumes. 12:1287-1291 |
| ISSN: |
1474-6670 |
| DOI: |
10.1016/s1474-6670(17)65555-1 |
| Popis: |
Described in this paper is a low-cost investigation to compare surface finishes by studying the reflection behaviour of small radiant heat pulses, these pulses being generated in the form of a pseudo-random binary sequence (p.r.b.s.) The use of p.r.b.s. signals greatly simplifies the correlation equipment necessary, thus making it a practical proposition for low-cost technical applications. The analysis of these signals is in effect a rapid method of obtaining the average result of many individual tests which can be performed in the presence of extraneous influences. The technique described compares surface finishes by making use of the fact that heat will ~eflect in a different way from different surface conditions. A pseudo-random binary sequence (p.r.b.s.) pattern of small heat pulses is directed on to a surface and the subsequent reflection pattern monitored by a temperature sensor. The signal from this sensor is processed (correlated) by simple low-cost electronic circuitry to give a voltage level which varies with the roughness of the surface being considered. The results which have been obtained for different surface conditions of the same material suggest that this method of application may be effective for the monitoring of the surface finish of products during a production cycle although the investigation is still in the experimental stage. A suggested microprocessor based system is described in the conclusion of this paper together with the expected advantages gained by using this development as compared with the analogue system described in the main body of the paper. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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