Hey guys, first post here, so I’m working on my first project and I have a question, also I should note that I’m beginner-status with electronics.
I’m using an infrared temperature sensor to measure the temperature of objects, and I want to measure objects that are just a little bit higher in temperature than the operating range. I’m using an MLX90614, so the max temperature according to literature is about 720 F, and I’d like to be able to measure to around 900 F. The objects that I am measuring range from 200 F to 900 F.
I know that the sensors output is a function of the sensors input minus the electrical resistance generated by the sensor, so do I just need to create my own calibration curves for the temperatures that I want? Or would I need to alter my circuit a bit? For example, I know sometimes you have to put resistors on the output from a sensor and then you must compensate for that in determining the actual output from the sensor.
I’m a chemical engineering student (not electrical) so this is all somewhat new to me. I’m taking a class called ‘process controls’ and we talk about sensors and creating closed-loop control systems. I understand most the science going on but some aspects of the electronics are new to me. From theory I want to be able to say that I could use resistors to shift the operating range of my IR sensor up a bit, so instead of measuring 0-700F it could measure 300-1000F but I’m not sure if thats possible or not.
So I guess basically my question is “if my sensor’s max operating temperature is 700 F and I attempt a measurement of 800 F, what happens?”
Does it go like this?
input = 3.3 v
output = 1.5 v
from the voltage difference, temp is calculated
so at max op temp,
input = 3.3 v
output = 0v ?
Any help would be appreciated