Computerized Measurement Systems (EEMN10) 2016

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1 Computerized Measurement Systems (EEMN10) 2016 CHRISTIAN ANTFOLK & JOSEFIN STARKHAMMAR Course information 2016 Course administrators: Christian Antfolk Josefin Starkhammar Course webpage : 1

2 Course information 2016 Course information 2016 Goal: to give an overview of systems and methods to collect measurement data with the help of a computer in test and industrial environments. To program such a system in eg. LabVIEW or Matlab in a logical and structured way in order to solve a measurement task. Lectures: Lectures in this room (E:1328), Mondays & Fridays Course litterature: Will be made available on the course webpage Grades: Passed assignments (handed in on time!), laboratory exercises and project = grade 3. Higher grades require taking the exam. If you decide NOT to follow the course please let us know 2

3 Course information Assignments Assgn 1: LabVIEW (Hand-in deadline Sunday ) Assgn 2: DAQ Boards (Hand-in deadline Sunday ) Assgn 3: Home Lab (Hand-in deadline Sunday ) 2 Labs Lab 1: GPIB (Week 46, room E:1309b)» Wednesday at 8-12 or Thursday at 8-12 Lab 2: DAQ-PAD (Week 47, room E:1309b)» Wednesday at 8-12 or Thursday at 8-12 Course information 2016 Project: Build a measurement system (room E:1309B) Choose project week 3 of the course Short project description and suggested approach to solution Sunday Short oral presentation Monday written report Report hand-in Friday Gear : PC with LabVIEW and Matlab 3

4 Example projects (previous years) FPGA/CompactRIO-based measurements (industry) Automated Voltage vs. Frequency measurement for an acoustophoresis setup (BME) Control of pneumatic actuators for stimulation in an fmri environment. (Radiation Physics / BME) Schedule (subject to change) Preliminary schedule for EEMN Week Day Date Time Place Lect no: Topic Lecturer Assignments Labs (E:1309b) Project 44 Monday E: Introduction to the course CA Friday E: LabVIEW I (introduction, variables, structures etc) JS LabVIEW II (subvi's, error wires, data flow control) :: Assgn 1 45 Monday E: info JS Assgn 1: LabVIEW(Deadline Sunday ) Friday E: Databuses and communications : Project suggestion list CA Monday E: LabVIEW III :: Instrument control :: Lab1 and Assgn 2 info & prep JS Assgn 2: DAQ board 46 (Deadline Sunday Lab1 : GPIB Friday E: LabVIEW in industry / Design patterns DVEL ) Choose project 47 Monday E: Data acquisition boards and USB DAQ :: Lab 2 info & prep CA Project plan Lab2: DAQ (Deadline Sunday PAD Friday E: Signal conditioning CA ) Monday E: Signal processing data presentation, questions and check up CA 48 Software for measurement systems (LabCVI, Measurement Friday E: Studio, HP VEE, Dasylab) CA Assgn 3: Home Lab assignment Data acquisition using Matlab :: Assgn 3 info & prep + LabVIEW (Deadline ) Project execution 49 Monday E:1328 Elmät JS/GUEST Friday E:1328 NO LECTURE 50 Monday E: Project presentation / demonstrations CA/JS Friday E:1328 NO LECTURE Report hand in 2 Wednes day E:1328 EXAMINATION 4

5 Overview of the course content Computerized measurement system example Physical quantity Measurement system Signal processing Sensor Signal conditioning, eg. filters & amplifiers Instrument with data bus interface, eg. USB or PXI Personal computer Physical quantity, eg. soundwave 5

6 Structure of a measurement system Physical quantity pressure temperature speed angular velocity luminosity force Measurement system Signal conditioning DAQ-cards Bus control of GPIB (parallel) RS232 (serial) Bus systems with integrated and standardized VXI/PXI Real time controllers Field buses Presentation (and control) Graphical programming LabVIEW Agilent VEE DASYlab Textual programming LabWindows CVI Measurement Studio Visual Basic Visual C/C++ Matlab Structure of a measurement system Physical quantity pressure temperature speed angular velocity luminosity force Measurement system Signal conditioning DAQ-cards Bus control of GPIB (parallel) RS232 (serial) Bus systems with integrated and standardized VXI/PXI Real time controllers Field buses Presentation (and control) Graphical programming LabVIEW Agilent VEE DASYlab Textual programming LabWindows CVI Measurement Studio Visual Basic Visual C/C++ Matlab 6

7 Signal conditioning How does the sensor/transducer work? Change in resistance (strain gauge, Pt100) -> Wheatstone bridge Voltage (thermocouple, piezo transducer) Current (semi-conductors) -> generate known voltage drop over known R Filterering (50 Hz), isolation (opto), amplification? A/D conversion Adapt the signal to the working range of the A/D converter Dynamic range (Difference between the smallest and biggest measurable values) How many bits (resolution) does the measurement system has to have to meet the need for measurement accuracy? (8 bits = 2^8=256 signal levels across the measurement range) (+ 10 V => 78 mv per level. 16 bit => 0.3 mv per level) Structure of a measurement system Physical quantity pressure temperature speed angular velocity luminosity force Measurement system Signal conditioning DAQ-cards Bus control of GPIB (parallel) RS232 (serial) Bus systems with integrated and standardized VXI/PXI Real time controllers Field buses Presentation (and control) Graphical programming LabVIEW Agilent VEE DASYlab Textual programming LabWindows CVI Measurement Studio Visual Basic Visual C/C++ Matlab 7

8 Example of a DAQ card 16 Analog inputs 12-bit A/D converter 1 multiplexed A/D converter 110 khz sampling frequency Programmable range 2 x 12-bit Analog Outputs Internal or external trigger Structure of a measurement system Physical quantity pressure temperature speed angular velocity luminosity force Measurement system Signal conditioning DAQ-cards Bus control of GPIB (parallel) RS232 (serial) Bus systems with integrated and standardized VXI/PXI Real time controllers Field buses Presentation (and control) Graphical programming LabVIEW Agilent VEE DASYlab Textual programming LabWindows CVI Measurement Studio Visual Basic Visual C/C++ Matlab 8

9 General Purpose Interface Bus Introduced by HP MB/s Requires special cables and och plug-in cards Max 20 m total cable length and 15 Still very much used for instrument control in both industry and research environments, probably due to the rugged connectors General Purpose Interface Bus 9

10 Structure of a measurement system Physical quantity pressure temperature speed angular velocity luminosity force Measurement system Signal conditioning DAQ-cards Bus control of GPIB (parallel) RS232 (serial) Bus systems with integrated and standardized VXI/PXI Real time controllers Field buses Presentation (and control) Graphical programming LabVIEW Agilent VEE DASYlab Textual programming LabWindows CVI Measurement Studio Visual Basic Visual C/C++ Matlab Serial communications RS-232 Unbalanced (one ground wire + one active wire) Point-to-point Up to 19,2 kbit/s at 15 m cable RS-422 Balanced (both wires are active but in opposite phase) Point-to-point Up to 2 Mbit/s RS-485 Balanced (both wires are active but in opposite phase) Multiple units are connected in parallel, however the communication is serial (Multidrop) Up to 10 Mbit/s 10

11 Comparison RS232 RS422 1 Tx 0 GND RS232 Tx+ RS422/RS485 Tx- Serial communication USB, FireWire, Ethernet 5 m cable for USB, 5 Gbit/s (USB 3), FireWire 72 m cable 3.2 Gbit/s Ethernet 72 m cable 10 Gbit/s SATA 3 8 m cable Up to 6 Gbit/s Designed to send data quickly to harddrives 11

12 Example of USB based system Structure of a measurement system Physical quantity pressure temperature speed angular velocity luminosity force Measurement system Signal conditioning DAQ-cards Bus control of GPIB (parallel) RS232 (serial) Bus systems with integrated and standardized VXI/PXI Real time controllers Field buses Presentation (and control) Graphical LabVIEW LabCVI Measurement Studio Agilent VEE (DASYlab) Command LabWindows Visual Basic Visual C/C++ Matlab 12

13 What is a computer bus? A collection of wires which transfer digital data according to a specific protocol between separate units. There are several standards to allow seamless connectivity of from a number of different vendors. Example : PCI, USB, GPIB, Firewire, SATA, Ethernet, etc Example of entire systems with specific computer buses incorporated in each unit are fieldbuses, VXI-systems, PXI-systems, real-time controllers etc. The PCI bus in a PC The PCI-bus, 32 bits, 133 MB/s, 33 MHz Peripheral Component Interconnect The PCI-e bus, PCI-express, 64 bits, 256 MB/s per line (total of 20 lines), 2 GHZ Full duplex = to send and receive data at the same time => 512 MB/s 13

14 VXI VMEbus extensions for Instrumentation Faster and more compact than GPIB (40 MB/s with a 32 bit bus) Produced by 250 vendors Can be connected through MXI (Multisystem extension Interface), or GPIB if there are other more traditional in the system FireWire (IEEE-1394), USB, LAN etc PXI PCI extensions for Instrumentation Like VXI but with PCI bus More compact, cheaper Also PXIe for the faster PCI express bus 14

15 Real time controllers Basic idea: combine measurement tasks and signal generation with dedicated hardware Advantages: fast, robust Car industry, power industry, automation Plug in cards Stand alone module Industrial systems Fieldbuses Used to interconnect automation devices in a network Heavily used in industry 15

16 Fieldbuses Fieldbuses - example Cars (CAN-bus) More and more gadgets and driver aid systems has increased the total weight of the wiring in cars. (Engine control systems, ACC, ABS, ESP...) Gambro s AK100 Elevators Photo copy machines Toys 16

17 Why use fieldbuses Distributed intelligence gives: Less cabling, especially over long distances Measurement cells can be made self calibrating or be calibrated remotely through the bus Self diagnostic systems Flexible system when transducer units are exchanged Structure of a measurement system Physical entety pressure temperature speed angular velocity luminosity force Measurement system Signal conditioning DAQ-cards Bus control of GPIB (parallel) RS232 (serial) Bus systems with integrated and standardized VXI/PXI Real time controllers Field buses Presentation (and control) Graphical LabVIEW LabCVI Measurement Studio Agilent VEE DASYlab Command LabWindows Visual Basic Visual C/C++ Matlab 17

18 LabVIEW National Instruments Graphical Programming Language G Current version LabView 2016 Virtual Instruments Virtual Three mail building blocks: Data collection (software for communication with measurement device, e. g. ordinary instrument, DAQcard or through VXI/PXI) Analysis (statistics, filtering, spectral analysis...) Presenation (all settings can be handled through the program window which is designed for the specific measurement task, data presentation etc. Hence, the name Virtual Instrument) 18

19 Example of a LabVIEW program Front panel Example of a LabVIEW program Block diagram 19

20 Dataflow programming Execution determined by the structure of the program A poor example of a LabVIEW program 20

21 A better example of a LabVIEW program Download LabVIEW & Matlab LabVIEW Go tohttp:// Download LabVIEW Student serial number : M79X96296 Matlab Go to Log in Follow the instructions 21

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