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. To learn more about lighting with natural light, see also my earlier tutorial “Filming Outdoors – Light Reflector”.Corner Reflectors Can Cause Surprise Clutter You can get these reflectors on eBay and Amazon.

The larger one I used costs around $15 and the smaller one around $10. Also, the golden reflector helped me add a fun, upbeat and sunny feel to the music video. Since it is usually sunny in LA, it made perfect sense to light using the sun. As an example, I will use the music video “Feelin’ Like” that I shot in Los Angeles for JReyez. In this tutorial, I will show you how I light using just the sun and a reflector. This way I can move fast and save a lot of money by not renting those huge and expensive HMI Par lights (but if you want to learn to use HMI Pars, I have a tutorial about them too).

Even though I normally have access to lighting equipment, I often just use the sun and a reflector to light the films or music videos I work on.

Reflector 2 tutorial