Sensors/Data Acquisition

Guarded Two-Dimensional Flat Plate Insulation Test Calorimeter with Attach Points

Consistent test results are obtained in a cost-effective, safe, reliable, and practical manner. John F. Kennedy Space Center, Florida Insulation systems usually do not operate on their own; they must work together with a structural system that is designed to support the article being insulated. Typically this structure penetrates the insulation, degrading it in some manner, and gives a pathway for the conduction of unwanted heat. High-performance insulation systems that use reflective foils are highly anisotropic (the heat flows more easily in one direction than the others), so disturbing the temperature gradients through the material can cause much greater effects than are due to the disturbances alone.

Posted in: Articles, Briefs, TSP, Data Acquisition, Sensors


Test, Calibration, and Training Target for a Microwave Sensor

NASA’s Jet Propulsion Laboratory, Pasadena, California Human subjects are unsuitable for objective performance testing of victim detection radar because their heart and respiration rates are not controllable or repeatable. There are limitations on human targets from a safety standpoint as well. It is difficult to relate the ground truth to the measured data for a human target without needing additional equipment that must be attached to the human subject. Artificial targets using pneumatics do not provide sufficient fidelity of the radar return for development of identification algorithms.

Posted in: Articles, Briefs, TSP, Sensors


Computed Tomography Systems

JG&A Metrology Center (Detroit, MI) introduced increased flat panel sizes for computed tomography (CT) systems. Cone beam systems now utilize flat panel technology and scan parts up to 14" (350 mm) in diameter. With increases in LDA sizes as well, the CT systems use line detector array technology when scanning parts up to 26" (650 mm) in diameter. The equipment is used to provide 3D internal part inspection using industrial CT equipment.

Posted in: Products, Detectors


Data Acquisition and Control

Dataforth Corp. (Tucson, AZ) introduced the MAQ20® industrial data acquisition and control system that features an analog resistance input module for channel protection. It interfaces to three types of 3-wire sensors: 100Ω Pt, 120Ω Ni RTDs, and potentiometers up to 5kΩ. The module has six input channels, each of which is protected up to 240 Vrms continuous overload in case of inadvertent wiring errors. Overloaded channels do not adversely affect other channels in the module. Transient protection is per the ANSI/IEEE C37.90.1 standard; input-to-bus isolation is 1500Vrms. The system can individually configure channels for sensor, range, alarm limits, and averaging. While all channels are enabled by default, those not used can be disabled to increase the sampling rate of channels enabled for scanning.

Posted in: Products, Data Acquisition, Sensors


Data Acquisition Board

Measurement Computing (Norton, MA) offers the USB-2020 high-speed, two-channel data acquisition board that provides simultaneous sampling at rates up to 20 MS/s per channel. Users can sample data from both channels at an overall rate of 40 MS/s to the 64-megasample onboard memory, or continuously stream data to a host computer at up to 8 MS/s for one or both channels over a high-speed USB connection. Each channel has its own A/D converter for simultaneous sampling to eliminate channel skew and ensure that phase information between channels is maintained.

Posted in: Products, Board-Level Electronics, Data Acquisition


Data Acquisition Module

ADLINK Technology (San Jose, CA) announced the USB-1210 USB 2.0 data acquisition module that supports four 16-bit channels of simultaneous sampling at up to 2 MS/s per channel, and ensures zero data loss in long-term data acquisition by way of 256- MS deep onboard FIFO (First In, First Out). The 4-channel USB DAQ with simultaneous sampling delivers -100 dB THD and 14.3-Bit ENOB (effective number of bits) at up to 2 MS/s. Up to 16-sec. data buffer enables long-term data acquisition and recording at full speed (2 MS/s), preventing data loss from slow CPU response under heavy system loading. Built-in precision reference voltage for autocalibration eliminates the need for external instruments. It supports external digital/analog trigger source and flexible trigger modes, and 500 VDC isolation protects the connected computer from hazardous voltage caused by improper signal connection.

Posted in: Products, Data Acquisition, Measuring Instruments


Temperature Scanner Indicators

The Sensor Connection, a division of Harold G. Schaevitz Industries LLC (Troy, MI), offers the model PMD-MXT temperature scanner indicator. The 32-channel microprocessor-based temperature scanner provides continuous monitoring of up to 32 channels of thermocouple or RTD sensors. The 14-mm-tall digit-red LED display is easy to read at a distance. Rows of LED annunciators warn of specific channel alarm conditions. The scanner has two user-selectable HI/LO, HI/HI, or LO/LO alarm set points, configured through front panel pushbuttons.

Posted in: Products, Sensors, Monitoring