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lab 5 - introduction_to_daq

lab 5 - introduction_to_daq - MAE 3113 Measurements and...

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MAE 3113: Measurements and Instrumentation Lab 5 Introduction to Data Acquisition (DAQ) Written by: Jeremy Morton and Nick Phelps Objective The objective of this week’s lab is to construct an alarm system to monitor two pieces of equipment, in a factory-like setting. The alarm system will be build using sensors that are connected to a data acquisition unit and configured with LabView software. The two pieces of equipment to be monitored are a pressurized air tank and a shaker motor. A 120 Ohm strain gage has been attached to the pressurized air tank, which will allow for the pressure in the tank to be indirectly measured. The shaker motor is being monitored with an accelerometer to measure vibration, a microphone to measure acoustic intensity, and a thermocouple used to measure the temperature. The following criteria will be used for monitoring. If any of the following conditions are met the alarm should go off. The pressure in the air tank exceeds ___ psi The vibration as read by the accelerometer is greater than ___ The magnitude of the signal from the microphone exceeds _____ The temperature at the input wires is greater than 130 ºF. The signal from the accelerometer is grater than ____ , while the signal from the microphone is greater than ____. An Overview of DAQ Data Acquisition (DAQ) is process of collecting physical measurements and converting them to a format such that they can be stored and used electronic on a device such as a computer. Given that physical measurements come in different forms, various methods must be employed when preparing the input signals. The various sensors are first feed into a signal conditioner. The signal conditioner used in this laboratory set-up is the NI SC-2345, which has 16 channels of input. The signal conditioner is initially empty, but the top lid can be opened where various modules can be plugged in. The modules are specific to the type of measurement to be made (voltages, acoustic, strain, etc…). The signal conditioner can take both analogue and signals. Analogue signals are converted to digitized signals, and are done so at a predetermined sample rate. Once the signal has been conditioned properly and is in an acceptable form, the DAQ unit handles the process of supplying the signal to your computer. In the lab there are two different DAQ devices that can be used. One of the DAQ devices is a PCI card that is a board that is permanently plugged into the PC. The other DAQ device is a USB unit
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that prepares the signal to be sent to your computer’s USB port. Both devices ultimately
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lab 5 - introduction_to_daq - MAE 3113 Measurements and...

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