The commonly seen corner reflectors are dihedral and trihedral. In general, the corner reflector consists mutually intersected perpendicular plates. Therefore, corner reflector is a useful device for Radar system calibration. Retrieved on February 25, 2015.Corner reflector is a passive device used to reflect radio waves back toward the emission source directly. Illustration 1, as well as additional reference material, is from “Corner Reflector.” In Wikipedia. Reflectors are an important consideration for any application design and should always be considered. may be able to meet sensor needs with a semi-custom version of the sensor. Contact the MaxBotix Inc., technical support team to see what options are available to you. Sometimes this is not an option because sensitivity is required for the application. Select a sensor with a narrower beam pattern, Place a soft material over the suspected target. Try these options to resolve issues with an unwanted corner reflector: If the detection goes away, you likely have a corner reflector at that location. If you are experiencing unwanted detections from a suspected corner reflector, the best testing is to place a soft material over the suspected target and see if the unwanted detection goes away. As such, these reflectors present the sensor with a target larger than the actual size. When a corner reflector is placed inside the blue area and angled towards the sensor, the reflecting sound can result in an unwanted detection.Corner reflections may amplify signal returned similar to a satellite dish. In Illustration 2, the blue shaded area represents where the transmitted sound from the sensor travels. The sound continues to spread the further it gets from the sensor. When the sound is sent from the sensor, it covers a much larger area than the detection pattern. Illustration 2: Blue shows the area covered by the sound sent from the sensor. We display this information as beam patterns. The area where the sound reflects back to the sensor is considered a detection pattern. When the sound hits the target, it is either reflected back to the sensor or reflected away from the sensor. When using an ultrasonic sensor, the sensor transmits sound towards the target. Each of these examples can create a corner reflector that may cause unwanted detections. Some examples of common corner reflectors follow a bookshelf along with a wall, a curb in a parking lot, a 1/2″ wide seam in a concrete floor, internal bracing in a bin, or the inside corner of a doorway in a narrow hall. Illustration 1 shows two examples of corner reflectors. A half circle also acts as a similar reflector. A corner reflector is two flat surfaces joining together to create a 90° angle. Corner reflectors can be surprisingly small, yet present a large reflection back to the sensor.Certain objects are prone to causing corner reflections. These types of detections are the result of reflectors present in the environment. Sometimes when using an ultrasonic sensor, users experience detection of unwanted objects that appear outside the expected beam pattern. Illustration 1: Two common shapes of corner reflectors. Corner Reflectors Can Cause Surprise Clutter
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