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Sensor Photodiode
Need for high-resistance fixed resistors in sensor circuit experiment?
Essentially, I have conducted an experiment to measure the sensitivity of a photodiode (using a potential-divider-and-photodiode-circuit and a lamp, which was moved gradually moved towards the photodiode.)
The circuit consisted of a power supply (providing 6V) connected in series to a photodiode and a fixed resistor (the value of which was changed at several stages during the experiment). A potential divider was the constructed around the photodiode; it consisted of a multimeter, which tapped off the voltage across the photodiode. I was then able to measure the change in voltage as the lamp changed distances (and thus as the light intensity changed).
However, it became apparent during the experiment that higher value fixed resistances (used in the potential divider circuit) made the multimeter measurements more sensitive.
Why was this?
It sounds as if you were using the photodiode in photo-conductive mode, that is, it is reverse biased by the 6V source. The light detected then produces a photocurrent proportional to the level of illumination - the number of photons per second reaching the sensitive region of the photodiode. The signal you measured is the voltage produced by this current across the fixed load resistor(s) in the potential divider circuit ie
Signal voltage = photocurrent x load resistance
and this will increase, at a given level of illumination, if you increase the load resistance.
You could alternatively have used the multimeter in current-measuring mode to determine the photocurrent directly, in which case you would not have observed this effect. The currents are relatively small, so it's possible that the meter available did not have enough sensitivity to do this.
The reverse current produced by the 6V bias should remain nearly constant, and may be determined from the signal observed with no illumination of the photodiode.
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Ophir Nova 1Z01500 Handheld Digital Laser Power Meter Sensor Thermal Photodiode | |
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Photo Diode Detector Head Sensor +20dBm Laser Optics | |
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Led matrix emitting and sensing light.
What should I use as a float for a water sensor unit?
I'm working on a "senior project" with 8 others in order to get my BSEE, building a water purification system. We need to detect the level of the water using a photodiode, so I need a good float. The problem is, the tube is slightly less than 1" ID, so we haven't found anything small enough. What we have in mind is a small hollow ball, and I've found some very small ones on the web, but I can only buy them in bulk packs of 1000. If anyone has any ideas please let me know. Thanks!
since its very small, its also probably very light. can you just cut a tiny piece of styrophome to the size that you need and use it as a float??
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