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San Jose, CA, United States

Yang L.,Shanghai University | Zhou Z.,RAE Systems
IEEE Sensors Journal | Year: 2014

A low power consumption micro electro-mechanical system catalytic combustible low explosion limit (LEL) sensor was fabricated. The microheater was characterized by a suspending microhotplate over the silicon substrate. The alumina slurry and Pd-Pt catalyst solution were precisely and repeatedly coated on the microhotplate by a novel digital microfluid technique, respectively. Furthermore, the alumina layer and the alumina/catalyst layer on the microheater showed the collinear resistance versus voltage thermal characteristic curves during the solidification, which indicated that a good match could be directly made between them. During aging, the alumina/catalyst element demonstrated a high initial signal and then fell rapidly before coming to a stable value. Through pairing the alumina reference and alumina/catalyst sensitive elements in the wheatstone bridge, the output voltage could be up to 36 mV at the 50% LEL level of CH4 at the working temperature of 400°C and the operation voltage was 2.6 V. The power consumption and the signal sensitivity could be also down to 75 mW and up to 0.702 mV/LEL%, respectively. © 2001-2012 IEEE.

The present invention discloses a sampling and detection device for detecting volatile organic content in water, comprising a hollow sampler (

RAE Systems | Date: 2013-09-26

The present invention provides an explosion-proof miniaturized combustible gas sensor, comprising: a metal casing having an accommodation space therein; a wire mesh, a vertical surface perpendicular to a side surface where the wire mesh is located and the other side surface opposite thereto being used as a transfer surface of the combustible gas; a heat insulation module embedded in the metal casing; a detection module sensitive to a combustible gas; a compensation module insensitive to a combustible gas and matching the detection module; where the detection module has a higher catalytic combustion activity than the compensation module; a sealant, where a bonding length of the sealant in the accommodation space of the metal casing is used as an effective bonding surface, and the effective bonding surface is perpendicular to the transfer surface. The present invention has the advantages of a miniaturized size, good explosion-proof property and reliable performance.

News Article | April 17, 2008
Site: www.siliconbeat.com

Less than a month after announcing a 10 percent reduction to its workforce, or a loss of about 130 jobs, RAE Systems gave its chief executive and co-founder Bob Chen a 25 percent raise April 11, boosting his salary by $70,000 to $350,000, according to an SEC filing. Chief Financial Officer Randall Gausman was also given a raise in his salary, which climbed $25,000, or 11 percent, to $250,000. Chen was also given an option good for 200,000 shares, which closed the day they were granted at day at $1.80, down about a third from the end of 2007. They’ve lost value every year since 2005. RAE’s biggest shareholder probably is OK with the arrangement, because he is the same Robert Chen, who owned some 15.7 million shares, or 27 percent of the company, as of February 2007. “Driving profitable revenue growth is our top priority in 2008,” said Chen in a statement announcing the job cuts March 28. Revenue for the San Jose supplier of technology used to detect hazardous materials rose 34 percent last year to a record $90.9 million. Its net loss, however, grew from $1.5 million in 2006 to $14.7 million last year, also a record.

Zhu Z.,Taiyuan University of Technology | Xu Y.,RAE Systems | Jiang B.,RAE Systems
Sensors (Switzerland) | Year: 2012

A non-dispersive infrared (NDIR) methane gas sensor prototype has achieved a minimum detection limit of 1 parts per million by volume (ppm). The central idea of the design of the sensor is to decrease the detection limit by increasing the signal to noise ratio (SNR) of the system. In order to decrease the noise level, a single frequency filter algorithm based on fast Fourier transform (FFT) is adopted for signal processing. Through simulation and experiment, it is found that the full width at half maximum (FWHM) of the filter narrows with the extension of sampling period and the increase of lamp modulation frequency, and at some optimum sampling period and modulation frequency, the filtered signal maintains a noise to signal ratio of below 1/10,000. The sensor prototype provides the key techniques for a hand-held methane detector that has a low cost and a high resolution. Such a detector may facilitate the detection of leakage of city natural gas pipelines buried underground, the monitoring of landfill gas, the monitoring of air quality and so on. © 2012 by the authors; licensee MDPI, Basel, Switzerland.

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