For user manuals and dimensional drawings, visit the product page resources tab on ni.com.
Last Revised: 2013-01-15 15:04:11.0
Optical Sensor Interrogator
NI PXIe-4844
4 optical channels
10 Hz full spectrum scan frequency
1510 to 1590 nm wavelength range
Automatic sensor detection and configuration utility for fiber Bragg gratings
Compatibility with extrinsic Fabry-Perot, long period grating (LPG), and other optical
sensors
Rugged carrying case with shoulder strap
1-year warranty
Overview
The NI PXIe-4844 optical sensor interrogator is a dual-slot 3U PXI Express data acquisition module for fi ber Bragg grating (FBG) optical sensors. It has four optical channels that
are simultaneously sampled at 10 Hz for measurement of FBG strain and temperature sensors. The NI PXIe-4844 features an optical core, which combines a high-power, low-
noise swept wavelength laser with fi ber Fabry-Perot tunable fi lter technology from Micron Optics. Each optical channel has an 80 nm wavelength range (1510 to 1590 nm), which
can typically scan up to 20 FBG sensors per channel (more than 80 FBG sensors per module, depending on sensor range and sensitivity). You can further extend the maximum
number of FBG sensors per module by connecting one or more optical channels to an external optical multiplexer or by adding more NI PXIe-4844 modules in the same PXI
chassis. The NI PXIe-4844 can also be integrated into the same chassis as other PXI modules for electrical data acquisition and control.
Back to Top
Requirements and Compatibility
OS Information
Real-Time OS
Windows 7
Windows Vista
Windows XP
Driver Information
NI-OSI
Software Compatibility
LabVIEW Development System
LabVIEW Real-Time Module
Back to Top
Application and Technology
Benefits of Optical Sensing
Nonconductive, electrically passive immune to electromagnetic interference
Measure over long distances (up to 10 km) without loss of signal accuracy
Daisy chain dozens of sensors, including temperature, strain, and pressure, along a single optical fiber
Simplified cable management and lightweight fiber
No required calibration of the sensor or interrogator (onboard NIST-traceable wavelength reference)
Potential for longer fatigue life and faster response than electrical sensors
Measurement Services Software (included)
NI-OSI driver software for LabVIEW (32-bit)
NI-OSI Explorer configuration utility
1/6
www.ni.com
You configure the NI PXIe-4844 and FBG sensors in the NI-OSI Explorer, a configuration manager that scans the optical wavelength range to identify all connected FBG sensors.
After you specify the range and scaling equations for each detected FBG, all scans automatically parse the channel data into individual sensor measurements and scale the data
into appropriate engineering units. You can export this scaling confi guration for use in the NI-OSI LabVIEW API.
The NI-OSI LabVIEW API has a similar look and feel to NI-DAQmx driver software. Data is returned as an array that you can directly wire to a LabVIEW chart to display scaled
data in a value-versus-time format.
Figure 1. Interrogation of an FBG with a broadband light source results in the reflection of a specific wavelength.
Theory of Operation
A fiber Bragg grating (FBG) is an in-fiber structure that reflects specific wavelengths of light while allowing all others to transmit (Figure 1). The reflected wavelength (Bragg
wavelength) is a function of both temperature and strain, enabling FBGs to be used as sensors. Each FBG has a unique Bragg wavelength set by the vendor during
manufacturing. You can daisy chain FBGs with different nominal Bragg wavelengths within a single optical fiber as long as each FBG occupies a unique wavelength range within
the 80 nm optical spectrum of the NI PXIe-4844.
Benefits of FBG Technology
Electrical sensor measurements have several limitations associated with the environment in which they operate: they are prone to noise induced by electromagnetic interference
(EMI), they require frequent calibration, they may require external power/excitation, and they are subject to failure when used within harsh environments. Other challenges in
distributed civil and geotechnical applications involve the difficulty of installation, the permanent nature of the system, and the large amount of wiring required.
Benefits of FBG Optical Sensing
Nonconductive, electrically passive and immune to EMI
Measurements over long distances (up to 10 km) without loss of signal accuracy
Ability to daisy chain dozens of sensors, including temperature, strain, and pressure, along a single optical fiber
No required calibration of the sensor or interrogator with NIST-traceable wavelength reference
Measure Anywhere
Ability to mix and match different measurement types on the same sensor array
Simplified cable management and lightweight fiber
Potential for faster response than thermocouples and longer fatigue life than foil strain gages
Potential for immunity to lightning, high voltages, and corrosion depending on sensor packaging
Ability to embed sensors in composite materials
Advantages of the NI Optical Sensor Interrogator
Traditional optical measurement devices provide fixed software functionality and a fixed user interface. This lack of flexibility limits the system’s ability to meet many structural test
and monitoring application needs. In addition, traditional optical sensing instruments are not designed for easy integration with electrical measurements or control systems, which
is often required in real-world structural and environmental measurements. The NI optical sensor interrogator (OSI) offers seamless integration with
NI LabVIEW, a graphical development environment for customizable software and easy UI development. The NI PXIe-4844 is also based on the PXI platform, providing modular
I/O for easy integration with a wide variety of PXI and PXI Express devices, including conventional thermocouple, strain, and vibration devices as well as analog and digital
outputs for control requirements.
PXI Express
High-performance PCI Express bus
Advanced differential timing and triggering backplane
Integration with electrical I/O with more than 1,500 PXI modules
Modular I/O for easy expansion
Easy to Use
NI-OSI Explorer utility for automatic sensor detection and simplified sensor configuration for easy scaling to physical units
NI-OSI driver software with easy-to-use LabVIEW API including common optical measurement functions
Tight integration with LabVIEW for data analysis, viewing, and logging
Application Examples
Civionics
– distributed measurements over long distances, including bridges, buildings, and other civil structures
– big physics, material testing, vehicle prototyping
Back to Top
Ordering Information
For a complete list of accessories, visit the product page on ni.com.
Products
NI PXIe-4844
NI PXIe-4844 4 Ch. Optical Sensor Interrogator
Part Number
Recommended Accessories
Part Number
781285-01
No accessories required.
Back to Top
Software Recommendations
NI LabVIEW Full Development
System for Windows
Fully integrated graphical system design
software
Support for a wide range of measurement
hardware, I/O, and buses
Custom, event-driven user interfaces for
measurement and control
Extensive signal processing, analysis, and
math functionality
Advanced compiler to ensure
high-performance execution and code
optimization
NI LabVIEW Real-Time
Module
Design deterministic real-time applications
with LabVIEW graphical programming
Download to dedicated NI or third-party
hardware for reliable execution and a wide
selection of I/O
Take advantage of built-in PID control, signal
processing, and analysis functions
Automatically take advantage of multicore
CPUs or set processor affinity manually
Includes real-time operating system (RTOS),
development and debugging support, and
board support
Purchase individually or as part of an NI
Developer Suite bundle
Back to Top
Support and Services
System Assurance Programs
NI system assurance programs are designed to make it even easier for you to own an NI system. These programs include configuration and deployment services for your NI PXI,
CompactRIO, or Compact FieldPoint system. The NI Basic System Assurance Program provides a simple integration test and ensures that your system is delivered completely
assembled in one box. When you configure your system with the NI Standard System Assurance Program, you can select from available NI system driver sets and application
development environments to create customized, reorderable software configurations. Your system arrives fully assembled and tested in one box with your software preinstalled.
When you order your system with the standard program, you also receive system-specific documentation including a bill of materials, an integration test report, a recommended
maintenance plan, and frequently asked question documents. Finally, the standard program reduces the total cost of owning an NI system by providing three years of warranty
coverage and calibration service. Use the online product advisors at ni.com/advisor to find a system assurance program to meet your needs.
Calibration
NI measurement hardware is calibrated to ensure measurement accuracy and verify that the device meets its published specifications. To ensure the ongoing accuracy of your
measurement hardware, NI offers basic or detailed recalibration service that provides ongoing ISO 9001 audit compliance and confidence in your measurements. To learn more
about NI calibration services or to locate a qualified service center near you, contact your local sales office or visit ni.com/calibration.
Technical Support
Get answers to your technical questions using the following National Instruments resources.
Support
- Visit ni.com/support to access the NI KnowledgeBase, example programs, and tutorials or to contact our applications engineers who are located in NI sales
offices around the world and speak the local language.
Discussion Forums
- Visit forums.ni.com for a diverse set of discussion boards on topics you care about.
Online Community
- Visit community.ni.com to find, contribute, or collaborate on customer-contributed technical content with users like you.
Repair
While you may never need your hardware repaired, NI understands that unexpected events may lead to necessary repairs. NI offers repair services performed by highly trained
technicians who quickly return your device with the guarantee that it will perform to factory specifications. For more information, visit ni.com/repair.
Training and Certifications
The NI training and certification program delivers the fastest, most certain route to increased proficiency and productivity using NI software and hardware. Training builds the skills
to more efficiently develop robust, maintainable applications, while certification validates your knowledge and ability.
Classroom training in cities worldwide
- the most comprehensive hands-on training taught by engineers.
3/6
www.ni.com
Classroom training in cities worldwide
- the most comprehensive hands-on training taught by engineers.
On-site training at your facility
- an excellent option to train multiple employees at the same time.
Online instructor-led training
- lower-cost, remote training if classroom or on-site courses are not possible.
Course kits
- lowest-cost, self-paced training that you can use as reference guides.
Training memberships
and training credits - to buy now and schedule training later.
Visit ni.com/training for more information.
Extended Warranty
NI offers options for extending the standard product warranty to meet the life-cycle requirements of your project. In addition, because NI understands that your requirements may
change, the extended warranty is flexible in length and easily renewed. For more information, visit ni.com/warranty.
OEM
NI offers design-in consulting and product integration assistance if you need NI products for OEM applications. For information about special pricing and services for OEM
customers, visit ni.com/oem.
Alliance
Our Professional Services Team is comprised of NI applications engineers, NI Consulting Services, and a worldwide National Instruments Alliance Partner program of more than
700 independent consultants and integrators. Services range from start-up assistance to turnkey system integration. Visit ni.com/alliance.
Back to Top
Detailed Specifications
The following specifications are typical for the NI PXIe-4844 operating at 25 °C unless otherwise noted.
Bus Interface
Form factor
x4 PXI Express, v1.0 compliant
Lasers
Type
Class
Output power (continuous wave)
Min
Max
Beam diameter
Beam diameter
Number of lasers
Wavelength range
Sample rate
Optical dynamic range
Wavelength accuracy
Wavelength stability (0 °C to 55 °C)
Wavelength repeatability
0.06 mW
0.25 mW
9 mm (0.35 in.)
0.1
4
1510 nm to 1590 nm
10 Hz ± 0.1 Hz
40 dB
1 pm
1 pm
1 pm
Fiber laser
1
Physical Characteristics
If you need to clean the NI PXIe-4844, use a soft, non-metallic brush. Make sure that the device is completely dry and free from
contaminants before returning it to the PXI Express chassis.
Note
For two-dimensional drawings and three-dimensional drawings of the NI PXIe-4844 module and connectors, visit
ni.com/dimensions
and search by module number.
Dimensions (without connectors)
Weight
Slot requirements
Slot compatibility
13.1 cm × 21.4 cm × 4.1 cm
(5.1 in. × 8.4 in. × 1.6 in.)
213g (7.5 oz)
Two side-by-side PXI Express slots, other than slot
one
x4, x8, and x16 PXI Express or PXI Express hybrid
slots
4/6
www.ni.com
Safety Standards
This product is designed to meet the requirements of the following standards of safety for electrical equipment for measurement, control, and
laboratory use:
IEC 61010-1, EN 61010-1
UL 61010-1, CSA 61010-1
Note
For UL and other safety certifications, refer to the product label or the
Online Product Certification
section.
Electromagnetic Compatibility
This product meets the requirements of the following EMC standards for electrical equipment for measurement, control, and laboratory use:
EN 61326 (IEC 61326): Class A emissions; Basic immunity
EN 55011 (CISPR 11): Group 1, Class A emissions
AS/NZS CISPR 11: Group 1, Class A emissions
FCC 47 CFR Part 15B: Class A emissions
ICES-001: Class A emissions
Note
For EMC declarations and certifications, refer to the
Online Product Certification
section.
Laser Compliance
This product meets the requirements of the following laser compliance standards for electrical equipment for measurement, control, and laboratory
use:
IEC 60825-1, ED 2.0, 2007-03; US CDRH 21 CFR Subchapter J
Note
For EMC declarations and certifications, refer to the
Online Product Certification
section.
CE Compliance
This product meets the essential requirements of applicable European Directives, as follows:
主题：自备终端(BYOD)发展趋势;用员工自己的移动设备来控制对工作设施及设备的使用，会对信息安全产生怎样的影响;在不使公司有安全风险或不损害员工隐私的前提下，有哪些方式能安全地实现这样的设施及设备使用。 自备终端(Bring Your Own Device，简称BYOD)，即企业允许员工离职时保留自己的手机，这种做法正日益流行。如今智能手机功能也越来越多，我们不仅能用自己的手机访问电脑、网...[详细]
与云数据库相比，小型计算机是专门为网络边缘的去中心化坚固计算而构建的。通过将应用程序、分析和处理服务移动到更靠近数据生成源的位置，业务运营可以获得改进的实时计算应用程序性能。 l 从奔腾到酷睿i5的可扩展CPU性能 l 智能电源点火管理和CAN总线网络支持 l 无线局域网和广域网LTE连接 l 丰富的I/O可扩展性，包括PoE、PCI、PCIe、COM l 适用于宽工作温度和宽电压输入的坚固...[详细]
模拟与混合信号
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
