Lets say I have a light intensity sensor and I want to measure the exact average light intensity for one hour using an ADC sampling time that is much less than the input signal frequency. Lets also say I could setup as many ADC's as needed so that the moment one is converting, one is sampling... no overlaps or gaps between any sampling period.
Will this allow me to obtain the exact average light intensity for as long as this sampling happens?
From my understanding an ADC uses an RC circuit, charging up to the voltage of the source. Does it also deplete if the voltage drops during the sampling?
A simplified example:
The ADC has a sample time of 1ms. The sensor gives out a voltage equivalent to 20 units for 0.5ms. The next 0.5ms of sampling the sensor is at 0 units. Do I get an ADC value of 10 units for that sample period?
I am not after any particular signal frequency, just the average intensity. Is it possible to do this or do I have to focus on ensuring the sample rate is >= the Nyquist frequency to obtain this data.