LabVIEW工程师指南：实践与应用详解

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"《LabVIEW for Engineers》是一本专为工程领域专业人士编写的指南，由Ronald W. Larsen撰写，他在蒙大拿州立大学任职。该书作为Prentice Hall出版系列的一部分，旨在帮助工程师们更深入地理解和应用LabVIEW这一强大的图形化编程环境。LabVIEW是一款由National Instruments开发的软件，特别适合于数据采集、控制系统设计、实时数据分析等工程应用。书中内容涵盖了LabVIEW的基础概念、高级编程技巧以及在实际项目中的实践案例，使读者能够掌握如何利用LabVIEW的强大功能来提升工作效率和创新解决方案。从章节布局到实例演示，作者通过清晰的步骤指导读者从入门到精通，无论是硬件接口控制还是复杂的算法实现，都能找到相应的教学和实践指导。此外，本书的出版团队包括了多位资深编辑和市场管理人员，他们确保了内容的专业性和实用性。从VP编辑总监到助理编辑，每个角色都对最终产品的质量负责，体现了出版社对教育和专业书籍严谨的态度。制作方面，包括了设计、排版和印刷等多个环节，确保了图书的高质量呈现。阅读《LabVIEW for Engineers》，工程师们不仅能够获取技术知识，还能了解到如何有效地将这些知识应用于工程实践中，从而提高他们的工程技能和创新能力。无论是在实验室、制造业还是科研机构，这本书都是工程师们提升自身技术水平和解决问题的重要参考资料。"

Introduction

1.1 WHAT IS LABVIEW?

In the past, LabVIEW was just a graphical programming language that was

developed to make it easier to collect data from laboratory instruments using

data acquisition systems. LabVIEW was always easy to use once you got used

to wiring connectors to write your computer programs, and it definitely makes

data acquisition an easier task than without LabVIEW, but LabVIEW is not

just for data acquisition any more.

LabVIEW can be used to perform the following:

• acquire data from instruments

• process data (e.g., filtering, transforms)

• analyze data

• control instruments and equipment

For engineers, LabVIEW makes it possible to bring information from

the outside world into a computer, make decisions based on the acquired data,

and send computed results back into the world to control the way a piece of

equipment operates.

As an example, the LabVIEW program (front panel) shown in Figure 1.1

reads a process measurement (a temperature value) from a piece of equipment,

compares the measured process temperature with the desired temperature

(called a setpoint), and outputs a signal to a controller to try to control the

temperature at the setpoint value. You can see in Figure 1.1 that when the

temperature went above setpoint, the controller output decreased. This causes

a valve on a heat source to close (partially) to bring the temperature back to

setpoint.

In this brief example:

• A temperature value was read from an external device.

• The desired setpoint temperature was entered on a control on the front panel.

• A controller output was calculated using a PI Controller algorithm.

• The controller output was written to an external device.

Objectives

After reading this chapter,

you will know:

what LabVIEW is and how

it can be used to acquire,

process, and analyze data

what a LabVIEW VI is, and

how front panel and block

diagrams are used

how to start LabVIEW

and create a blank VI

how to use LabVIEW menus

to open and save VIs

CHAPTER

Base Full Student Pro Dev Topic

✓

✓ ✓ ✓ ✓ Trig Functions

✓ ✓ ✓ ✓ ✓ Boolean Functions

✓ ✓ ✓ ✓ ✓ Matrix Math

No* ✓ ✓ ✓ ✓ Simultaneous Equations Function

✓ ✓ ✓ ✓ ✓ File I/O

✓ ✓ ✓ ✓ ✓ Graphs

✓ ✓ ✓ ✓ ✓ Basic Statistics

No ✓ ✓ ✓ ✓ Interpolation

No ✓ ✓ ✓ ✓ Curve Fitting

No ✓ ✓ ✓ ✓ Regression

No ✓ ✓ ✓ ✓ Integration

No ✓ ✓ ✓ ✓ Differentiation

No ✓ ✓ ✓ ✓ Differential Equations

*An easy workaround is presented in the text.

Section 1.3 Conventions in the Text 3

text. Instead, we will focus on using the mathematical power of LabVIEW to

tackle the analysis of data sets, whether they are acquired from an experimental

system or not.

1.2.2 LabVIEW Versions

LabVIEW is a well-developed program, and the changes from one version to another

are small.The author has used LabVIEW 8.5 and LabVIEW 2009 Full versions with no

added bells or whistles in developing the examples in this text. For the material covered

in this text, users of earlier versions of LabVIEW will see very few differences.

LabVIEW is sold in the following packages:

• Base Package—reduced mathematics functionality

• Full Package—complete set of math functions

• Student Edition—full package with a watermark in the lower right corner of each

front panel

• Professional Package—can create stand-alone applications

• NI Developer Suite—includes extra add-ons and toolkits

In this text, we will make use of many of the math functions that are available

only in the Full, Student, Professional, and Developer packages. Some of the more

advanced analysis techniques illustrated in this text will be unavailable in the Base

package. For example,

It is assumed that the reader has access to at least the Student LabVIEW package.

1.3 CONVENTIONS IN THE TEXT

The following conventions are used in this text:

• Keywords—shown in italics the first time they appear.

• Literals—items meant to be typed exactly as they appear in the text are shown in

bold font.

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