The pulse width is a measure of the elapsed time between the leading and trailing edges of a single pulse of energy. The measure is typically used with electrical signals and is widely used in the fields of radar and power supplies. There are two closely related measures. The pulse repetition interval measures the time between the leading edges of two pulses but is normally expressed as the pulse repetition frequency (PRF), the number of pulses in a given time, typically a second. The duty cycle expresses the pulse width as a fraction or percentage of one complete cycle. Pulse width is an important measure in radar systems. Radars transmit pulses of radio frequency energy out of an antenna and then listen for their reflection off of target objects. The amount of energy that is returned to the radar receiver is a function of the peak energy of the pulse, the pulse width, and the pulse repetition frequency. Increasing the pulse width increases the amount of energy reflected off the target and thereby increases the range at which an object can be detected. Radars measure range based on the time between transmission and reception, and the resolution of that measurement is a function of the length of the received pulse. This leads to the basic outcome that increasing the pulse width allows the radar to detect objects at longer range but at the cost of decreasing the accuracy of that range measurement. This can be addressed by encoding the pulse with additional information, as is the case in pulse compression systems. In modern switched-mode power supplies, the voltage of the output electrical power is controlled by rapidly switching a fixed-voltage source on and off and then smoothing the resulting stepped waveform. Increasing the pulse width increases the output voltage. This allows complex output waveforms to be constructed by rapidly changing the pulse width to produce the desired signal, a concept known as pulse-width modulation. (Wikipedia).
Physics - Optics: Single Slit Diffraction (10 of 15) Angular Size as a Function of Slit Width
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain numerically why the angular size is dependent on the slit width and wavelength. Next video in series: https://youtu.be/FW44jdfUMp4
From playlist PHYSICS 61 DIFFRACTION OF LIGHT
The focal length is the distance between your camera’s sensor and the optical center of the camera lens. If you have a longer focal length, the overall perspective will be reduced, the subject will be closer, and areas won’t be as clear. The opposite is true for a shorter focal length. It
From playlist Digital Photography
Ex: Find the Arc Length of a Linear Function
This video provides an example of how to determine the arc length of a rlinear function using integration and using the distance formula. Site: http://mathispower4u.com
From playlist Applications of Integration: Arc Length, Surface Area, Work, Force, Center of Mass
Arc length of vector functions example
Free ebook http://tinyurl.com/EngMathYT Example of how to calculate arc length of a vector function.
From playlist A second course in university calculus.
Ex: Find the Arc Length of a Quadratic Function
This video provides an example of how to determine the arc length of a quadratic function using integration. The integral is evaluated using a graphing calculator and an integration formula. Site: http://mathispower4u.com
From playlist Applications of Integration: Arc Length, Surface Area, Work, Force, Center of Mass
Introduction to Arc Length Calculus 3
Introduction to Arc Length Calculus 3
From playlist Calculus 3
Ex: Find the Dimensions and Area of a Field Given the Perimeter
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From playlist Applications: Solving Linear Equations in One Variable
555 Timer IC - Low Frequency Pulse Generator Circuit
This electronics video tutorial explains how to use the 555 timer IC to create a low frequency pulse generator circuit. The frequency of the circuit is dependent on the values of the two resistors and capacitor of the circuit. Increasing the resistance of R1 or the capacitance of C1 decr
From playlist Electronic Circuits
LESSON 15: Arduino Color Sensor and RGB LED
This tutorial shows you how to create a project where a color sensor reads the color of a colored card, and then sets the RGB LED to that color. This is done with an arduino microcontroller. The system works well for a wide variety of colors, not just the primary colors. More details see a
From playlist Arduino Lessons
Electrical Engineering: Ch 19: Fourier Transform (5 of 45) Widening a Pulse to Infinity
Visit http://ilectureonline.com for more math and science lectures! In this video I will show what happens to Fourier transform when we take a single input pulse and widen it to infinite. Next video in this series can be seen at: https://youtu.be/cR74_yEHo8o
From playlist ELECTRICAL ENGINEERING 18: THE FOURIER TRANSFORM
13: Spectral Analysis Part 3 - Intro to Neural Computation
MIT 9.40 Introduction to Neural Computation, Spring 2018 Instructor: Michale Fee View the complete course: https://ocw.mit.edu/9-40S18 YouTube Playlist: https://www.youtube.com/playlist?list=PLUl4u3cNGP61I4aI5T6OaFfRK2gihjiMm A brief review of Fourier transforms, spectral estimation, wind
From playlist MIT 9.40 Introduction to Neural Computation, Spring 2018
Electrical Engineering: Ch 19: Fourier Transform (9 of 45) Conv. from Fourier Series to Transform
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain the relationship between the Fourier series and Fourier transform with respect to the number of pulses. Next video in this series can be seen at: https://youtu.be/KRfS_3tnKec
From playlist ELECTRICAL ENGINEERING 18: THE FOURIER TRANSFORM
Outdoor LED Screen teardown (+how to drive LEDs with video)
A look inside a large outdoor LED screen, including detailed technical analysis of drive techniques for LED video displays.
From playlist Teardowns
Laser Fundamentals I | MIT Understanding Lasers and Fiberoptics
Laser Fundamentals I Instructor: Shaoul Ezekiel View the complete course: http://ocw.mit.edu/RES-6-005S08 License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
From playlist MIT Understanding Lasers and Fiberoptics
Mechatronics with MATLAB and Simulink, Part 8: PWM of Voltage
Get a free trial of Simulink: https://goo.gl/ScEHEe Learn more about Mechatronic Systems: http://goo.gl/f86YFy This is the 8th video in the series Mechatronics with MATLAB and Simulink. This video describes how voltage delivery to a device, like a DC Motor, can be provided through power el
From playlist Mechatronics with MATLAB and Simulink
12: Spectral Analysis Part 2 - Intro to Neural Computation
MIT 9.40 Introduction to Neural Computation, Spring 2018 Instructor: Michale Fee View the complete course: https://ocw.mit.edu/9-40S18 YouTube Playlist: https://www.youtube.com/playlist?list=PLUl4u3cNGP61I4aI5T6OaFfRK2gihjiMm Covers Fourier transform pairs and power spectra, spectral esti
From playlist MIT 9.40 Introduction to Neural Computation, Spring 2018
Vernier caliper / diameter and length of daily used objects.
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From playlist Fine Measurements
Laser Fundamentals II | MIT Understanding Lasers and Fiberoptics
Laser Fundamentals II Instructor: Shaoul Ezekiel View the complete course: http://ocw.mit.edu/RES-6-005S08 License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
From playlist MIT Understanding Lasers and Fiberoptics
What are adjacent angles and linear pairs
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From playlist Angle Relationships