Acuity Imaging (Nashua, NH), a Robotic Vision Systems Inc. (Hauppauge, NY) company that supplies multiple-purpose 2-D machine-vision systems, has announced the acquisition of Trigon Technologies Inc. (Farmington Hills, MI). . . . Digital Imaging Inc. (Apopka, FL) has been awarded a Phase II Small Business Innovation Research contract by Eglin Air Force Base (Fort Walton Beach, FL) to produce two thermal cameras that incorporate polarized quantum-well infrared photodetector staring focal-plane arrays. . . . Irvine Sensors Corp. (Costa Mesa, CA) has formed a new wholly owned subsidiary, MicroSensors Inc., that will seek to exploit Irvine Sensors` proprietary ultralow-noise electronics and related microsensors in the emerging market for microelectromechanical systems. . . . PixelVision Inc. (Beaverton, OR) has moved into a new facility that provides the company with an additional 14,000 sq ft of manufacturing space. . . .Unisys Corp.`s Computer Systems Group (Blue Bell, PA) has entered into a joint marketing and value-added reseller alliance with Greenway Corp. (Carrollton, GA) to sell its Windows NT-based check imaging solution.