| 摘要 |
<p>A converter (photodiode 1) exposed to solar radiation (2) provides a d.c. current proportionnal to the radiation, charging a charge capacitor (3). This capacitor is connected at the input (11) of an analogue-digital switch (12) which provide an output pulse as long as the voltage across the terminals of the capacitor exceeds a pretermined value (U). The output pulse controls a semi-conductor switch (5) so that, during the pulse, the charge capacitor (3) will run down through this switch (5). Since the pulse would stop and the discharge would already be finished when the voltage across the terminals of the charge capacitor falls below the predetermined value, the pulse is prolonged. To this effect and preferably, the pulse is brought back by a capacitor (21) at the input (11) of the analogue-digital switch (12) while a resistor (22) is connected between this input (11) and the charge capacitor (3). To measure the radiation energy the pulses are counted (counter 6) and to measure the radiation power a speed counter device (7) is used. </p> |
