ULTRASONIC SENSOR Flashcards
What sensor uses ultrasonic sound waves to detect the distance of objects?
Ultrasonic Sensor
When was SONAR first invented
1917 (World War I)
What was the primary purpose of SONAR?
navigate, communicate, and detect submarines and other underwater objects during world war I
What does SONAR stand for?
SO- sound
N- navigation
A- and
R- Ranging
(sensor)
Who invented the SONAR sensor?
Paul Langevin &
Frederic Zinn
What does SONAR sensor do?
Navigates and Communicates only UNDERWATER
What are the types of SONAR sensors?
Active SONAR & Passive SONAR
What is the difference between active and passive SONAR?
ACTIVE SONAR
- releases sound waves
- uses energy
PASSIVE SONAR
- doesn’t emit sound waves
(listens for sounds to detect)
- doesn’t use energy
What was the inspiration for the SONAR sensor?
Echolocation
What is echolocation?
The use of echos (reflected sound) and vibrations to locate objects. (observed in sea animals).
What is the “normal hearing” quantity for humans?
20 Hz
What is it called when a creature can hear quiet vibrations?
Infrasound
What is the “___” sound capacity that creatures such as bats possess?
Ultra, 20,000 Hz
What is the difference between an ECHO and a RECEIVER?
ECHO
- accurate
- measures time of sound wave travel
RECEIVER
- not accurate
- no measurement
Causes ultrasonic sensor to produce and emit ultrasonic pulse.
Trigger (TRIG)
What is the purpose of the trigger (TRIG)?
Causes ultrasonic sensor to produce and emit ultrasonic pulse.
What must be set for the trigger (TRIG) to function?
“events”
MEASURES TIME and RECEIVES reflected ultrasonic wave.
ECHO
What is the purpose of the ECHO?
- measures time
- receives reflected ultrasonic wave
What is the control system of the ultrasonic sensor?
Crystal Oscillator
What times the emission of ultrasonic waves?
Crystal Oscillator
What times the echo of ultrasonic waves?
Crystal Oscillator
What is the purpose of the Crystal Oscillator?
- control system of the ultrasonic sensor
- times the echo of ultrasonic waves
- times the emission of ultrasonic waves
What is the purpose of the receiver?
receives the reflected ultrasonic waves
What receives the reflected ultrasonic waves?
receiver
What preserves (and regulates) voltage to power the circuit.
Voltage Common Collector (VCC)
What is the purpose of the Voltage Common Collector (VCC)?
preserves (and regulates) voltage to power the circuit
What sends out ultrasonic waves?
Transmitter
What is the purpose of transmitter?
sends out ultrasonic waves
What is the purpose of ground (GND)?
Allows current to return to the power source (completing the circuit)
What allows current to return to the power source, completing the circuit?
ground (GND)
What are the 3 types of circuits?
Series, Parallel, Mixed
A mixed circuit allows connections to be designed in a way that ____ and _____ for different components.
meets specific voltage (VCC), current requirements
The ultrasonic sensor is an electronic device that measures the ____ to a target object by emitting ultrasonic sound waves.
one-way distance
What is the left big circle on the ultrasonic sensor?
transmitter
What is the right big circle on the ultrasonic sensor?
receiver
From left to right, name the parts on the bottom of the ultrasonic sensor
Voltage Common Controller (VCC)
Trigger (TRIG)
Echo
Ground (GND)
What is the top on the ultrasonic sensor?
crystal oscillator
