Hair tests are more likely to detect regular than occasional marijuana use. One study found that 85% of daily users tested positive for marijuana, versus 52% of occasional smokers (1-5 times per week). Ingested cannabis was less likely to be detected than smoked marijuana [ 01 ].
For the similarly named concept in computer science, see Finite state transducer. A transducer is a device that converts one form of energy to another. Usually a transducer converts a signal in one form of energy to a signal in another. Transducers are often employed at the boundaries of automation, measurement, and control systems, where electrical signals are converted to and from other physical quantities (energy, force, torque, light, motion, position, etc.).
How an ultrasound is performed. Before the exam, you will change into a hospital gown. You will most likely be lying down on a table with a section of your body exposed for the test. An ultrasound technician, called a sonographer, will apply a special lubricating jelly to your skin. This prevents friction so they can rub the ultrasound transducer on your skin. The transducer has a similar appearance to a microphone. The jelly also helps transmit the sound waves. The transducer sends high-frequency sound waves through your body. The waves echo as they hit a dense object, such as an organ or bone.