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Precision Tensioning Brake

Placid Industries’ Hystereis brakes features the company’s patented Cog-Buster to automatically smooth braking torque. Frictionless torque is produced by internal magnetic fields rather than contact between parts. Slip torque is smooth, accurate, and reliable, with long term stability and wide speed range. Even high slip RPM causes no wear. Torque is smooth even near zero RPM. Units from 0 to 11 oz.-in. to 0 to 250 oz.-in. rated torque, with heat dissipation to 110 watts are available from stock.

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Clutch/brake Module

Warner Electric’s Gen 2 electromagnetic clutch/brake modules feature several enhancements in performance and appearance, compared to the original C-Face design.

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Thermographic Imaging Selecting an IR Camera with the Right Detector

The thermographic imaging characteristics of an IR camera are largely determined by its detector assembly. Infrared radiation (IR) is focused onto the camera’s detector assembly, which is a focal plane array (FPA) that converts IR into a visual image depicting temperature variations across the camera’s field of view (FOV). The FPA consists of thousands of pixels, which could be fabricated from any one of the IR sensitive materials commonly used in these cameras. Most detector materials respond to a selected portion of the IR spectrum (Figure 1). Therefore, a camera selected for any given application should have the appropriate FPA material based on the IR characteristics of objects within the FOV and the user’s study objectives.

Posted in: Articles, Features, ptb catchall, Photonics

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Photonics Tech Briefs Announces 2007 Products of the Year

The votes are in and the winners of the 2007 Photonics Tech Briefs Readers’ Choice Product of the Year Awards have been selected. The three PTB Products of the Year will be presented at a special awards reception and dinner in New York City on April 22.

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Compact 6-DOF Stage for Optical Adjustments

Adjustments can be made in all translational and rotational degrees of freedom. NASA’s Jet Propulsion Laboratory, Pasadena, California The figure depicts selected aspects of a six-degree-of-freedom (6-DOF) stage for mechanical adjustment of an optical component. The six degrees of freedom are translations along the Cartesian axes (x, y, and z) and rotations about these axes (θx, θy, and θz, respectively). Relative to prior such stages, this stage offers advantages of compactness, stability, and robustness, plus other advantages as described below.

Posted in: Photonics, Briefs, ptb catchall, Tech Briefs, Photonics

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Product of the Month: 1940nm Diode Laser Arrays

DILAS (Tuscon, AZ) has introduced the first commercially available high-power diode laser arrays operating at 1940nm with wall plug efficiencies (WPE) of >10-percent.

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Pyroelectric Detectors

Spectrum Detector (Lake Oswego, OR) manufactures the LiTaO3 Pyro-electric Detector Hybrid for use in applications including energy measurement, power measurement, radiometry, spectral radiometry, and FTIR and IR Gas analysis. The large area, 9 mm spectrally flat pyroelectric detectors are offered in either a voltage or current mode circuit with NEP in the nW range and Rv as high as 13,000 V/W. An optional organic black absorbing coating adds flat spectral response from 0.25 to 14.0 μm.

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