I had a very general question about the use of magnetic prosimity sensors in quality control. I am working on my senior design project, and would like to use a magnetic proximity sensor to detect wether a container is still air tight based on the deflection of the wall of the container. Based on what I've read the sensors are commonly used in canning plants to do the same, and my project will be seeing a slower flow of containers. My question is concerning the general setup and installation of the sensor, mainly how I will measure a response; If I want the sensor to "flag" a container deflection as being unacceptable (I will have an actuator further down the line to remove "flagged" cans) , how do I set that value. Will I need to purchase a controler of some sorts, or is this dependent on how I set up my circuit?
As a mechanical engineering student, sensors are a new universe for me so please feel free to correct me if my understanding of how these sensors can be used is wrong.
These types of sensors are often just used as proximity sensors, so they simply provide a on-off signal. However, am planning on using some for my own project, which will provide an analog voltage, in proportion to the distance. However, these will also give different readings for different metals or metal thickness. And since your application is likely to need more accuracy than mine, I suspect that an inductive sensor is not the best choice. But,since they are non-contact, they are quite durable in a manufacturing environment.
Here is a link to one source, with an analog voltage output, for $181 USD,