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design and implementation of a labview based computer

Design and Implementation of a LabVIEW based Computer Control for - - PowerPoint PPT Presentation

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Design and Implementation of a LabVIEW based Computer Control for EPR Instrumentation Diploma Thesis Defense Matthias Kolja Miehl October 22, 2010 at 2:30 pm Milwaukee, Wisconsin, USA Medical College of Wisconsin MACC Fund Research Center

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Design and Implementation of a LabVIEW based Computer Control for EPR Instrumentation

Diploma Thesis Defense Matthias Kolja Miehl October 22, 2010 at 2:30 pm

Milwaukee, Wisconsin, USA Medical College of Wisconsin MACC Fund Research Center Room L3075

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LabVIEW based Computer Control

◮ Control and acquisition framework ◮ Easily change hardware ◮ All experiments in one application

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LabVIEW based Computer Control

◮ Control and acquisition framework ◮ Easily change hardware ◮ All experiments in one application

Figure: L-Band spectrometer at MCW’s Biophysics Research Department

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Contents

1

Introduction

2

Concept

3

Implementation

4

Test

5

Summary and Vision

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Contents

1

Introduction

2

Concept

3

Implementation

4

Test

5

Summary and Vision

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LabVIEW based Computer Control Introduction Motivation

Need MCW Research:

◮ New experiments ◮ Different spectrometers ◮ Changing Hardware

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LabVIEW based Computer Control Introduction Motivation

Need MCW Research:

◮ New experiments ◮ Different spectrometers ◮ Changing Hardware

Situation Use of separate programs for

◮ each experiment, ◮ each spectrometer, and ◮ were rewritten for new instruments.

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LabVIEW based Computer Control Introduction Motivation

Need MCW Research:

◮ New experiments ◮ Different spectrometers ◮ Changing Hardware

Situation Use of separate programs for

◮ each experiment, ◮ each spectrometer, and ◮ were rewritten for new instruments.

Problem

◮ Labor and time intensive tasks ◮ Reduction of actual research time

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LabVIEW based Computer Control Introduction Motivation

Motivation Increase the actual research time by reducing redundancy.

◮ Experiment implementation ◮ Changing hardware

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LabVIEW based Computer Control Introduction Motivation

Motivation Increase the actual research time by reducing redundancy.

◮ Experiment implementation ◮ Changing hardware

Goal Versatile framework:

◮ All experiments ◮ Every spectrometer

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LabVIEW based Computer Control Introduction Related Work

Existing Approaches

◮ WinEPR ◮ EWWin ◮ SpecMan4EPR

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LabVIEW based Computer Control Introduction Related Work

Existing Approaches

◮ WinEPR ◮ EWWin ◮ SpecMan4EPR

MCW’s Requirements

◮ Exchange of instruments ◮ Storing experiment settings ◮ Easy extension by customer

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Contents

1

Introduction

2

Concept

3

Implementation

4

Test

5

Summary and Vision

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LabVIEW based Computer Control Concept Key Requirements

Key Requirements

◮ All experiments in one application ◮ Instruments easily exchangeable ◮ Maintainability and extendability ◮ 32 and 64-bit driver support

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LabVIEW based Computer Control Concept Overall Structure

Core of Main Appl. Instrument Driver Instrument ... ... 64-bit 64 or 32-bit Exp. GUI ... Controls and Indicators Logic Internal Data Flow Inter-Process Communication Bus Hardware Abstraction Hardware

Figure: Overall application structure (concept)

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Contents

1

Introduction

2

Concept

3

Implementation

4

Test

5

Summary and Vision

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LabVIEW based Computer Control Implementation Overall Structure and Used Technologies

Core of Main Appl. Instrument Driver Instrument Client Tab Controls Multiple-Loop

Appl. Framework

Event Structure STM Server as EXE Module Hardware ... ... 64-bit EXE 64 or 32-bit EXE Exp. GUI ... Controls and Indicators Logic Internal Data Flow Inter-Process Communication Bus Hardware Abstraction Hardware Implementation Concept GPIB, LXI, ...

Figure: Overall application structure (implementation)

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LabVIEW based Computer Control Implementation Overall Structure and Used Technologies

Core of Main Appl. Instrument Driver Instrument Client Tab Controls Multiple-Loop

Appl. Framework

Event Structure STM Server as EXE Module Hardware ... ... 64-bit EXE 64 or 32-bit EXE Exp. GUI ... Controls and Indicators Logic Internal Data Flow Inter-Process Communication Bus Hardware Abstraction Hardware Implementation Concept GPIB, LXI, ...

Figure: Overall application structure (implementation)

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LabVIEW based Computer Control Implementation Overall Structure and Used Technologies

Figure: Tab control structure of the application

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LabVIEW based Computer Control Implementation Overall Structure and Used Technologies

Figure: Tab control structure as the operator sees it

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LabVIEW based Computer Control Implementation Overall Structure and Used Technologies

Core of Main Appl. Instrument Driver Instrument Client Tab Controls Multiple-Loop

Appl. Framework

Event Structure STM Server as EXE Module Hardware ... ... 64-bit EXE 64 or 32-bit EXE Exp. GUI ... Controls and Indicators Logic Internal Data Flow Inter-Process Communication Bus Hardware Abstraction Hardware Implementation Concept GPIB, LXI, ...

Figure: Overall application structure (implementation)

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LabVIEW based Computer Control Implementation Overall Structure and Used Technologies

Figure: Main program event handler loop

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LabVIEW based Computer Control Implementation Overall Structure and Used Technologies

Core of Main Appl. Instrument Driver Instrument Client Tab Controls Multiple-Loop

Appl. Framework

Event Structure STM Server as EXE Module Hardware ... ... 64-bit EXE 64 or 32-bit EXE Exp. GUI ... Controls and Indicators Logic Internal Data Flow Inter-Process Communication Bus Hardware Abstraction Hardware Implementation Concept GPIB, LXI, ...

Figure: Overall application structure (implementation)

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LabVIEW based Computer Control Implementation Overall Structure and Used Technologies

Figure: Implementation of the main program’s parallel loop structure

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LabVIEW based Computer Control Implementation Overall Structure and Used Technologies

Core of Main Appl. Instrument Driver Instrument Client Tab Controls Multiple-Loop

Appl. Framework

Event Structure STM Server as EXE Module Hardware ... ... 64-bit EXE 64 or 32-bit EXE Exp. GUI ... Controls and Indicators Logic Internal Data Flow Inter-Process Communication Bus Hardware Abstraction Hardware Implementation Concept GPIB, LXI, ...

Figure: Overall application structure (implementation)

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LabVIEW based Computer Control Implementation Overall Structure and Used Technologies

Core of Main Appl. Instrument Driver Instrument Client Tab Controls Multiple-Loop

Appl. Framework

Event Structure STM Server as EXE Module Hardware ... ... 64-bit EXE 64 or 32-bit EXE Exp. GUI ... Controls and Indicators Logic Internal Data Flow Inter-Process Communication Bus Hardware Abstraction Hardware Implementation Concept GPIB, LXI, ...

Figure: Overall application structure (implementation)

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LabVIEW based Computer Control Implementation Overall Structure and Used Technologies

Core of Main Appl. Instrument Driver Instrument Client Tab Controls Multiple-Loop

Appl. Framework

Event Structure STM Server as EXE Module Hardware ... ... 64-bit EXE 64 or 32-bit EXE Exp. GUI ... Controls and Indicators Logic Internal Data Flow Inter-Process Communication Bus Hardware Abstraction Hardware Implementation Concept GPIB, LXI, ...

Figure: Overall application structure (implementation)

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LabVIEW based Computer Control Implementation Driver Management

Startup of Drivers Communication Main Appl. Driver 1 Driver 2 Driver 2

starts

text_based_variable.ini

Write port for each driver Read port from respective section

Main Appl. Driver 1 Driver 2 Driver 2

STM Port x Port y Port z x, y, z z y x

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LabVIEW based Computer Control Implementation STM

Advantages:

◮ Command-based

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LabVIEW based Computer Control Implementation STM

Advantages:

◮ Command-based ◮ Hides transport layer details

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LabVIEW based Computer Control Implementation STM

Advantages:

◮ Command-based ◮ Hides transport layer details ◮ Minimizes network traffic

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LabVIEW based Computer Control Implementation STM

Advantages:

◮ Command-based ◮ Hides transport layer details ◮ Minimizes network traffic ◮ Small overhead

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LabVIEW based Computer Control Implementation STM

Advantages:

◮ Command-based ◮ Hides transport layer details ◮ Minimizes network traffic ◮ Small overhead ◮ High throughput

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LabVIEW based Computer Control Implementation STM

Variant Data

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LabVIEW based Computer Control Implementation STM

Variant Data

Figure: Code of modified STM write function block

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LabVIEW based Computer Control Implementation STM

Variant Data

Figure: Code of modified STM write function block Figure: Code of modified STM read function block

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LabVIEW based Computer Control Implementation STM

Variant Data

Figure: Modified STM function blocks for writing and reading

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LabVIEW based Computer Control Implementation STM

Command-Based Communication Framework

Client/Main Appl. Server/Driver

Data Receiver Command/ Parameter Sender

Network Communication

Commands + Parameters Data + Status Information Command Parser Medium Priority Tasks High Priority Task

Figure: STM’s command-based communication framework

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LabVIEW based Computer Control Implementation Main Program and Driver Structure

STM

Main Program Medium Priority (Transmitter) Command Parser Medium Priority (Processor) High Priority Event Handler Transmitter Receiver Main Driver

STM STM D a t a Q u e u e M e d i u m P r i

r

i t y Q u e u e H i g h P r i

r

i t y Q u e u e STM STM M a i n Q u e u e

Figure: Parallel loop structure of main program and drivers

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LabVIEW based Computer Control Implementation Main Program and Driver Structure

Figure: Actual loop structure of driver

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LabVIEW based Computer Control Implementation Resulting Information Flow

STM Command GUI in Main Appl. Driver Instrument Instrument Bus

Event structure
Queue
Main loop
Transmitter loop
Command Parser
Queue
Medium Priority (Processor) loop
LabVIEW driver function block

STM Bus Command STM Parameter

Figure: Resulting information flow on instrument control change

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LabVIEW based Computer Control Implementation Usages

Goal: Relation between drivers and instruments

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LabVIEW based Computer Control Implementation Usages

Goal: Relation between drivers and instruments

Figure: Instrument control clusters on instrument panel

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LabVIEW based Computer Control Implementation Usages

usage instrument 1

selects uses

driver 1 instrument 2 driver 2 instrument 3 driver 2

r
r

Figure: Usage concept

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LabVIEW based Computer Control Implementation Usages

L-Band.CW sim.ini ; assignment of instrument to usage ; --------------------------------- ; usage = instrument name [config] stepper motor = "DS345(1)" signal = "DS345(2)" adc = "NI PCI-6024E"

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LabVIEW based Computer Control Implementation Usages

L-Band.CW sim.ini ; EXE names ; --------- ; instrument name = driver name [driver] DS345(1) = "srds345" DS345(2) = "srds345" N8241A = "n8241a" N8241A Option 330 = "n8241a" NI PCI-6024E = "ni pci-6024e"

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LabVIEW based Computer Control Implementation Usages

L-Band.CW sim.ini ; instrument resource names ; ------------------------- ; instrument name = resource name [resource] DS345(1) = "17" DS345(2) = "18" N8241A = "TCPIP0::169.254.1.20::inst0::instr" N8241A Option 330 = "TCPIP0::169.254.1.22::inst0::instr" NI PCI-6024E = "Dev1"

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LabVIEW based Computer Control Implementation Usages

L-Band.CW sim.ini ; default parameters ; ------------------ ; parameter_DataType = value [signal] frequency_Digital = 1.000000 amplitude_Digital = 3.000000 phase_Digital = 0.000000

ffset_Digital = 0.000000

amplitude unit_Ring = 1.000000 waveform_Ring = 1.000000 write wfm file_Path = "/C/temp/waveform.txt" [...]

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LabVIEW based Computer Control Implementation Usages

usage instrument 1

selects uses

driver 1 instrument 2 driver 2 instrument 3 driver 2

r
r

Figure: Usage concept

signal DS345

selects uses

sdrs345 N8241A n8241a N8241A, 330 n8241a

r
r

Figure: Usage implementation

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LabVIEW based Computer Control Implementation Hardware Abstraction

Goal: Select different instruments for a usage

Main Appl. Driver Instrument standardized STM commands instrument specific bus commands

Figure: Driver as hardware abstraction layer

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LabVIEW based Computer Control Implementation Hardware Abstraction

Figure: Driver’s command parser loop

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LabVIEW based Computer Control Implementation Hardware Abstraction

Figure: Driver’s high priority loop

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LabVIEW based Computer Control Implementation Implemented Experiment

Figure: CW experiment GUI Collection page

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LabVIEW based Computer Control Implementation Implemented Experiment

Figure: CW experiment GUI Parameters page

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LabVIEW based Computer Control Implementation Implemented Experiment

Figure: CW experiment GUI Patrick page

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LabVIEW based Computer Control Implementation Implemented Experiment

Figure: CW experiment GUI Varian page

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LabVIEW based Computer Control Implementation Implemented Experiment

Figure: CW experiment GUI Instrument panel

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Contents

1

Introduction

2

Concept

3

Implementation

4

Test

5

Summary and Vision

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LabVIEW based Computer Control Test Measurement Setup

Measurement Setup Sample : Spin label Microwave frequency : 1.908 GHz (L-Band) Microwave input power : 120 µW Center field : 675 G Sweep : 105 G, i.e. 622.5 G .. 727.5 G Number of averages : 5 Acquisition time : ≈ 5:30 min

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LabVIEW based Computer Control Test Results

Figure: Collection page after 2nd collection

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LabVIEW based Computer Control Test Results

Figure: Collection page after 3rd collection

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LabVIEW based Computer Control Test Results

Figure: Collection page after 4th collection

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LabVIEW based Computer Control Test Results

Figure: Collection page after 5th collection

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LabVIEW based Computer Control Test Results

Figure: Plot of full data.xls

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Contents

1

Introduction

2

Concept

3

Implementation

4

Test

5

Summary and Vision

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LabVIEW based Computer Control Summary and Vision 66 / 72

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LabVIEW based Computer Control Summary and Vision

Key Features

◮ Can run on all spectrometers ◮ Can implement all experiments ◮ Faster experiment implementation ◮ Improved modularity and flexibility ◮ 32 and 64-bit driver capability ◮ Multi-core processors and multi-threading capable

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LabVIEW based Computer Control Summary and Vision

Issues

◮ Improve thread allocation ◮ Decrease time it takes to display acquired data ◮ Emphasize the common basis of experiments

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LabVIEW based Computer Control Summary and Vision

Discoveries

◮ Shared variables work unreliable for some applications ◮ Module based concept for large projects ◮ STM with case structure to avoid polling for new messages

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LabVIEW based Computer Control Summary and Vision

Future Improvements

◮ Adaptive Signal Averaging Technique ◮ Technical Data Management Streaming (TDMS) ◮ Implement more drivers

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Any Questions?

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Many thanks for your attention!