| 摘要 |
By means of the method, the adaptation luminance L20 is continuously measured in the approaching zone of the tunnel and the luminance of the road surface Lth in the entry zone of the tunnel. Lightingis controlled in steps determined on the basis of the annual course of changes in the adaptation luminance L20 for a preset ratio R = (Lth/L20)PRESET. For each lighting step of the operational levels of luminance Lth_m[i], appropriate matching ranges of changes of L20 are determined, in accordance with the expressions: L20max[i]=1.1.Lthe_m[i]/R L20min=Lth_m[i+1]/R. Depending on the currently measured value of the adaptation luminance L20curr., lighting is switched to a step matching the range in which L20curr. falls. Luminance of the road facing Lth_curr. is continuously controlled for testing the condition R.L20min.[i]<Lth_curr.<R.L20max[i]. In case this condition is disrupted, procedure for the determination of new ranges starts up, ensuring the observance of the requirement and complied with the specific state of the lighting unit (aging of the light sources and soiling of the luminaires) and the season of the year. The method is materialized when, to a personal computer, a central station (2) is connected, having two-way connection to controlled points (3 and 4), which, in turn, are coupled to luminance meters (5 and 7), respectively, for the measurement of L20 and with luminance meters (6 and 8) for measuring the luminance of the road surface Lth in the entry zone. The determination of the degree of operation of the adaptation lighting at entrance (A) is made based on the information supplied from luminance meter (5), which is transmitted digitally to the lighting control; controller (4) (units 2-8 are in microprocessor execution). The lighting is switched on in a degree, matching the range in which L20curr. falls Simultaneously, the current value of luminance Lth_curr. in which the lighting unit operates is recorded by the luminance meter (7), and the condition listed above is checked. In case it is violated, automatically, or by a permission of the dispatcher, procedure is started for the selection of new L20max[i] - L20min[i] for the different degrees.
|
