A test was conducted at a gun range located at 14750 Skyline Blvd, Los Gatos, CA 95033, to demonstrate the feasibility of detecting gunfire locations using three GRS units that are not connected by wires. Algorithms of time stamped signal processing were applied to the acquired data, and it was shown that the detection accuracy could be within 1 meter. This test exemplifies the application of GPS time stamping technology.
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The technology described in this article was successfully used in the Ground Recorder System to achieve a very high measurement of dynamic range for a recent NASA project. This technology is now integrated into the CoCo-80X portable hardware platform by Crystal Instruments.
Implementing MQTT in EDM allows users to remotely monitor and operate environmental tests (vibration, temperature, humidity) and take measurements using EDM DSA.
Read MoreFrequency Response Function (FRF) is widely used in structural testing. Accelerometers are typically used and the acceleration vs. excitation force is measured as FRFs.
Read MoreRoam Robotics is a San Francisco-based company expanding human mobility with wearable robotics focused in three areas: recreation support, medical orthotics, and military applications.
Each application requires a thorough investigation to ensure user safety and comfort. Crystal Instruments is proud to provide the four channel Spider-20E dynamic signal analyzer for Roam to perform acoustic testing on their products.
Read MoreNASA’s response to Crystal Instruments addressed items NASA found beneficial, items NASA wanted changed, and items NASA benchmark tested on the prototype units. The Crystal Instruments prototype GRS systems were delivered according to a contractual agreement and performed well when tested for each listed specification with some areas of improvement.
Read MoreThe accurate measurement of micro-vibrations is the first step of successful vibration contamination control. According to generic vibration criteria for vibration sensitive equipment, the RMS velocity of vibration criterion is from 50 to 3.1 μm/s (2000 to 125 μin/s). To measure such small amplitudes, high sensitivity and low frequency sensors must be used. Crystal Instruments provides the Wilcoxon WR 731 and PCB 393B31 accelerometers with the CoCo-80X data analyzer for this application.
Read MoreThe CoCo’s Save and Record functions are generally only discussed in the context of separate measurements. Although the Save and Record functions cannot be executed simultaneously, the CoCo is still able to store both the time waveform and FFT from the same set of original data. By exploiting the fact that FFT/block signals are always being buffered in the CoCo’s RAM, we can acquire the FFT signals while simultaneously recording the time waveforms to the SD card.
Read MoreLabVIEW is a visual programming workbench provided by National Instruments. It is used in a variety of applications for distributed testing, measurement, and control systems. When combined with powerful data acquisition systems like Crystal Instruments Spider systems, it can accept a wide range of inputs from a wide range of sensors to perform real time spectral processing. This combination also enables the deployment of large scale custom industrial and production systems.
Read MoreCrystal Instruments EDM 9.0 release combines the advantages of the Spider-20 product line’s small form factor and portability with the powerful modular and scalable Spider-80X/Xi systems during a single data acquisition application.
Read MoreThe Spider-20H, Spider-20HE, and Spider-20i received a hardware upgrade to support an impressive 256 kHz samping rate on all 4 input channels. It is the highest sampling rate offered in the market of compact analyzers. The high sampling rate is especially beneficial for measuring high orders and transient capture in blast tests, pyroshock events, drop shock tests, crash tests, etc.
In addition to the high samping rate, the input range is expanded to 20V to capture larger signals.
Read MoreCrystal Instruments EDM 9.0 release introduces new additions to the Spider product line featuring support for sampling rates up to 256 kHz.
The new Spider-80Hi and Spider-80Ci are scalable versions of the Spider system featuring the impressive new 256 kHz sampling rate. Recording can also be performed at sampling rates up to 256 kHz for all input channels, up to 512 channels per Spider system.
The compact, ultra-portable four channel version of the Spider has also been developed to support a 256 kHz sampling rate. Currently, three variations of the compact Spiders supporting the 256 kHz sampling rate are available: Spider-20H, Spider-20HE, Spider-20i.
Read MoreIt is difficult to imagine the actual vibration level and distribution from the numerical display or signals, which are basically a mathematical representation of the vibration experienced by the structure under test. Animating the structure’s deformation provides users with a clearer representation of the intensity from vibration.
Read MoreEDM’s Account Management program controls the accessibility of features from different users. This provides a structure for managing the privileges for different groups of users. The Account Manager can be used to prevent lower-level users from adjusting parameters or display settings. It also allows users to customize the toolbars for a simplified user interface. By hiding certain features, the UI can be made much easier to use.
Read MoreThe EDM Vibration Visualization feature is available in all modules of EDM software (VCS, DSA and Modal). This option provides fast and efficient structural model generation and full 3D visualization of the online vibration pattern on the structure under test
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