A method for generating the light radiation and switching on the light emitting diode of the radiation source in an optical sensor for tracking a linear textile material

摘要

The invention relates to the method for generating the light radiation for tracking a linear textile material, in which the source of the light radiation is a light emitting diode (1). In the course of generating the light radiation, the influence of the temperature of the light-emitting diode (1) on the intensity of this light radiation is eliminated, and its constant intensity is maintained. The invention also relates to the activation of the light-emitting diode (1), in which the anode of the light-emitting diode (1) is connected to the output of the operational amplifier (2) and the cathode of the light-emitting diode (1) via a series resistor (R3) to the negative pole of the Feed is connected, the LED (1) first resistor (R1), which is connected between the anode of the LED (1) and the negative input of the operational amplifier (2), and second resistor (R2), which is connected between the negative input of the Operational amplifier (2) and the cathode of the light-emitting diode (1) is switched on, are assigned in parallel, and where the positive input of the operational amplifier (2) is connected to the voltage (Ui) for setting the operating point of the radiation source.