Small targets, long range

ifm efector Diode Array Technology -- Using a diode array integrally mounted on an ASIC, the OJ sensor's convergent-beam technology precisely allows both small-object detection and background supression at long ranges using a high-pwer LED or laser. Previoulsy, single-diode background-supression sensors were good at essentially only one range (i.e., only one triangulation geometry) for the object and background unless mechanically adjusted, which required valuable time.

Precision position sensors traditionally have had to be placed closed to the objects they are to detect (usually 20-40 mm, with 100 mm the maximum)—putting them in harms way of impact with machinery or human operators. And those devices, even if able to detect from a reasonable distance, are often too large to fit in confined spaces around production machinery.

Now, thanks to patented diode-array technology, a small (24 x 45 x11 mm) sensor can sense from 15 to 400 mm because of a more powerful LED light source, or from 7 to 150 mm with a laser. Spot size diameter with the LED is 18 mm and the laser's 0.8-mm spot allows distance sensing below 0.5 mm. A 63-diode array is mounted on an ASIC for detection and processing in a single, integrated component. The array allows sensing at various distances because it can accommodate different target and background triangulation geometries without any mechanical adjustments. The OJ sensors come in front or side sensing body geometries. According to the company, cost is comparable to previous technology devices with less capability.

Applications for the sensor include error proofing as well as part detection. Users of the more precise laser variant of the OJ Series background suppression sensor are employing it to verify assembly integrity, such as correct seating of an o-ring, bolt tightness, or part press fit. A variety of fixed mounting brackets allows snap-in replacement without tools, eliminating realignment for fast production-line turnaround.

Contact: Ernie Maddox, ifm efector, 805 Springdale Dr., Exton, PA 19341, Tel (800) 441-8246; Fax (610) 524-2010, www.ifmefector.com; or enter 501 at www.designnews.com/info.