If you do smoke frequently, expect to test positive on a marijuana drug screen for anywhere from 3 weeks to almost 2 months. If you smoke everyday or several times a day, you can test positive for 2 months or more. Detection times also vary depending upon your weight, metabolism, and other person factors.
Definition: A transducer is a device that converts one form of energy â typically a signal â into another. Example: A speaker is a type of transducer that converts electrical energy (the audio signal) into mechanical energy (vibration of the speaker cone/diaphragm).
Ultrasound is an imaging modality that utilizes high-frequency sound waves to provide cross-sectional images of the body. The ultrasound machine has the following components: monitor, keyboard, processor, data storage and probe or transducer. A transducer performs two functions: it emits sound waves (echoes) at a certain frequency and captures the returning echoes at frequencies dependent on the tissues through which the waves traverse. The sound wave that is returned to the transducer is digitized to appear as echoes or dots on the screen.