| ??? 05/08/11 18:17 Read: times |
#182203 - DC Offset Responding to: ???'s previous message |
Kai said:
When you scroll down, you will find a schematic of such a sensor circuitry. You will see, that R1, R2 and C are components of this circuitry. In the text, they tell something about a modulation frequency of 1200Hz. This is the frequency by which the light is flickering. The sensor does not generate this frequency, but does only amplify this frequency, which comes from the modulated light, which is given to the sensor. So, the sensor is not exposed to constant light, but light that is modulated, for instance by the help of a chopper wheel I Can't understand your mean Kai, I've tested the sensor,it accepted dc IR signal for example Hand or soldering iron temperature easily!!!!?? Kai said:
This helps to eliminate the influence of DC-offsets and low frequency noise. this sensor is much dependent to interanl temperature,and temperature offset taken place approximately evrey 10 second in signal output by warming,i purchased max1968-a TEC controller,but this problem not solved yet completely, So i can't understand why you said elimination of DC-offset? do you have any approach for elimination this type of dc flickering? Kai said:
There is nothing to recompense, dear Mehdi... You Are very Kind Dear Kai,Thanks Agian |
| Topic | Author | Date |
| Datasheet question???? | 01/01/70 00:00 | |
| where | 01/01/70 00:00 | |
| High pass filter... | 01/01/70 00:00 | |
| pulsed light | 01/01/70 00:00 | |
| "typo" | 01/01/70 00:00 | |
| Thanks Andy | 01/01/70 00:00 | |
| chopping... | 01/01/70 00:00 | |
| DC Offset | 01/01/70 00:00 | |
| But gain is different for AC and DC! | 01/01/70 00:00 | |
| But gain is different for AC and DC? | 01/01/70 00:00 | |
| C reduces the gain for DC | 01/01/70 00:00 | |
I understood much more about this sensor | 01/01/70 00:00 | |
| Thank You Very Much | 01/01/70 00:00 |