Hello
I am trying to use a sensor that could give a signal when both water and objects flow thorugh a pipe.
The following are the options i found optimal:
1) IR LED & Photodiode: Placing the IR LED and Photodiode at opposite one sides. When objects come in between them, the photodiode receives no light and the output will be zero. When water comes in between them there will be refraction of llight in water and so the light may not fall directly to the photodiode.
2) Using Resistants :
To detect change in resistance when objects or water comes in between the sensing probes.
Can anyone suggest other methods that could sense both water and objects? Will there be any problems if i use the above mentioned methods? ( any negative impacts?)
I do not want to invest much money by buying commercial sensors.
Thanks for any comments
I am trying to use a sensor that could give a signal when both water and objects flow thorugh a pipe.
The following are the options i found optimal:
1) IR LED & Photodiode: Placing the IR LED and Photodiode at opposite one sides. When objects come in between them, the photodiode receives no light and the output will be zero. When water comes in between them there will be refraction of llight in water and so the light may not fall directly to the photodiode.
2) Using Resistants :
To detect change in resistance when objects or water comes in between the sensing probes.
Can anyone suggest other methods that could sense both water and objects? Will there be any problems if i use the above mentioned methods? ( any negative impacts?)
I do not want to invest much money by buying commercial sensors.
Thanks for any comments