While a conventional SRS (Secondary Restraint System) air bag system protects the driver by cushioning the secondary impact with the steering wheel during a frontal impact, the side-impact air bag is designed to gently force an occupant into the center of the vehicle and prevent contact with the door panel. Side-impact air bags are therefore designed to operate at higher inflation pressures and deflate slower than frontal-impact air bags. The critical test is the timing from the point of triggering the igniter to the point where the air bag begins to fill with gas. Ideally this time period should be less than 4 ms. This deployment test procedure should also be recorded by a high speed video camera according to SAE J211. The video can then be used to investigate, evaluate and analyze problems with the inflator or the structures of the seat or roof rails.
The Yokogawa ScopeCorders provide the following advantages for this application :
1. High Channel Count and Modular Architecture
In addition to measuring the ignition signal and the airbag pressure, other sensors may be valuable such as accelerometers, temperatures, and strain. ScopeCorder Input modules are available providing signal conditioning and scaling for these sensors as well as high sampling rate voltage input modules.
2. Versatile Measurement Functions and Cursors
Time measurements are rapidly achieved using cursor measurements. Other built-in measurements such as rise time can be calculated and saved to storage or captured in a screen shot.
The above figure is an example of measuring the output of a pressure sensor in an airbag.
A ScopeCorder combines the transient signal capturing capabilities of an oscilloscope with the long-term datalogging capabilities of a data recorder.The DL350 ScopeCorder is a portable instrument featuring the deep measurement and recording capabilities you need in the lab in a compact instrument you can take into the field. For “quick and easy” troubleshooting or sophisticated mixed-signal datalogging, the DL350 is a portable, powerful, and useable engineering tool that makes complete measurements completely portable.
ScopeCorder DL850E combines a mixed signal oscilloscope and portable data acquisition recorder into a modular platform designed to capture both high-speed transients and low speed trends. Using flexible modular I/O with built-in signal conditioning, precisely measure electrical, physical sensor signals and CAN/CAN FD/LIN/SENT serial bus for applications ranging from R&D research to in-vehicle data logging.
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Data acquisition (DAQ) is the measurement, recording, analyzing, and presentation of real world phenomena. It includes electrical measurements such as voltage, current, power as well as measurements through sensors and transducers including temperature, pressure, strain, vibration, and more.
A ScopeCorder is an instrument combining a mixed signal oscilloscope and portable data acquisition recorder into a modular platform designed to capture both high-speed transients and low speed trends. Yokogawa’s ScopeCorder product family provides flexible and high-performance multi-channel test instruments by combining a variety of signal conditioning input modules, on-board calculations, and deep data acquisition storage into a off-the-shelf data acquisition solution.