I am designing a voltage to light and light to voltage transducer.
They have to be linear.
For the V to Light, I used an op amp. Similarly for the L to V, I used an op amp.
At the light to voltage end, I am using the IFD 91 photodiode. I am not getting a linear response at this end. something like an S curve. Its not linear at the lower end and the higher end.
I don't have a light meter. So I am measuring the voltage at the output of the op amp.
Are photodiodes not linear?
Any ideas/suggestions to correct this.
TIA.
They have to be linear.
For the V to Light, I used an op amp. Similarly for the L to V, I used an op amp.
At the light to voltage end, I am using the IFD 91 photodiode. I am not getting a linear response at this end. something like an S curve. Its not linear at the lower end and the higher end.
I don't have a light meter. So I am measuring the voltage at the output of the op amp.
Are photodiodes not linear?
Any ideas/suggestions to correct this.
TIA.