Radiation source for a sensor arrangement with making current limitation

An optical sensor arrangement comprising:

• at least one radiation-emitting radiation source (102, 103),
• a measurement space (104), which can be filled with a fluid (110) containing at least one analyte to be measured,
• at least one detector (108) which detects the radiation and generates an output signal depending on the presence and/or concentration of the analyte,
• an incandescent lamp (101) of the radiation source,
• a semiconductor switch (V1) of the radiation source to switch a connection of the incandescent lamp (101) to a supply voltage (Vs), said switch having a first terminal which is connected to the incandescent lamp (101), and a second terminal which is connected to a reference potential, wherein in the switched-on state of the semiconductor switch (V1) a current path is formed between the first and second terminals, and wherein the semiconductor switch (V1) has a control terminal to apply a control signal (VCONTROL),
• a capacitor (C2) connected between the control terminal and the first terminal,
• a first resistor (R1), connecting the control terminal to the control signal and
• a second resistor (R2) or capacitor connecting the control terminal to the reference potential.