What is Pulse: Definition and 345 Discussions

In medicine, a pulse represents the tactile arterial palpation of the cardiac cycle (heartbeat) by trained fingertips. The pulse may be palpated in any place that allows an artery to be compressed near the surface of the body, such as at the neck (carotid artery), wrist (radial artery), at the groin (femoral artery), behind the knee (popliteal artery), near the ankle joint (posterior tibial artery), and on foot (dorsalis pedis artery). Pulse (or the count of arterial pulse per minute) is equivalent to measuring the heart rate. The heart rate can also be measured by listening to the heart beat by auscultation, traditionally using a stethoscope and counting it for a minute. The radial pulse is commonly measured using three fingers. This has a reason: the finger closest to the heart is used to occlude the pulse pressure, the middle finger is used get a crude estimate of the blood pressure, and the finger most distal to the heart (usually the ring finger) is used to nullify the effect of the ulnar pulse as the two arteries are connected via the palmar arches (superficial and deep). The study of the pulse is known as sphygmology.

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  1. D

    Total power of a pulsed source over time?

    Lets say I have an LED that is being pulsed once every two seconds. The LED uses 5 mA of current each time its fired and the pulse lasts for 40mS. I know the current into the LED because I measured the voltage drop across the dropping resistor of 420 ohms with a good O-Scope. So I know all...
  2. D

    How to Design a Microvolt Pulse Detector Circuit with High Gain and Low Noise

    I am currently working on a small personal project to design a few circuits. I am trying to built a circuit that can detect 100 uV pulses with a pulse width of about 10 uS. I'd like to boost the voltage to a value readable by an FPGA (let say ~2 volts). I'm currently thinking about the...
  3. M

    How Can I Generate a 1Hz Pulse for a Digital Clock Using 74LS90 and 74LS47?

    i'm new on creating my own circuit. And I'm trying to create a digital clock, using 74ls90+74ls47 I have problem on creating 1hz square pulse part. This is my teacher's Simulation I have searched on google that i can create 1hz pulse by using NAND gate, crystal, or Ne555, but i can't find any...
  4. J

    Pulse echo technique to find the distance of the Moon

    Homework Statement [/B] Over 40 years ago, the Apollo astronauts placed reflectors on the surface of the Moon. These are still used by a number of observatories on Earth to monitor the distance to the Moon by reflecting pulses of laser light from them and detecting the reflected signal...
  5. _maxim_

    A Best coil design for homogeneus NMR RF pulse on liquid discs

    Hi there, we have a NMR spectrometer equipped with a standard bore 54mm cryomagnet working at 14.1 T (600 MHz Larmor Frequency) produced by Oxford. I would implement a special probe capable of generating a RF pulse and reading a NMR answer from a sample that is not standard for such...
  6. O

    Python Wave on string: How can I create a traveling triangle pulse?

    I have the following program that moves a wave on a string with fixed ends. The program solves the wave equation given a initial condition wave. The initial condition is a triangle wave splitting into two pulses. Here is the code written in Python: from numpy import * from matplotlib.pyplot...
  7. archon

    Electric or magnetic field pulse generetor

    Hi, I would like to create an electric or magnetic pulses in an open ended cone, sphere or a tube. The pulse would have to be generated in such a way so that it is not actually connected with the container in any way (ie. it can't be a device in the center of the container which generates the...
  8. Lord Crc

    Observation of laser pulse propagation in optical fibers

    Just wanted to share this, mainly because I really liked the videos (found in the supplementary section at the end). Moderators, feel free to move it to a more appropriate place. Observation of laser pulse propagation in optical fibers with a SPAD camera Recording processes and events that...
  9. E

    Group delay with Gaussian pulse

    Hello! Starting from a gaussian waveform propagating in a dispersive medium, is it possible to obtain an expression for the waveform at a generic time t, when the dispersion is not negligible? I know that a generic gaussian pulse (considered as an envelope of a carrier at frequency k_c) can be...
  10. Simon Bridge

    A Gravity of a Light Pulse: Relation to E/c^2

    This came up in a discussion in another forum - the context was the gravity of a photon... for which we need quantum gravity. But imagining a pulse of monochromatic light, it was asserted that it's gravity could be well approximated by replacing one of the mass terms in Newton's Law by E/c^2. I...
  11. chikou24i

    Pulse current discharge test of a Li-ion

    Could someone please explain to me what is the definition of a pulse current discharge, and what do we mean by pulse current discharge test ?
  12. H

    I Does carrier pulse width vary with diffusion coefficient?

    Hello Physics Forums I’m doing some numerical studies on diffusion. I began with monte carlo simulations on gas diffusion, and more recently I’ve started to dabble in carrier diffusion inside semiconductors. It looks like diffusion in semiconductors is a lot more amenable to experimental study...
  13. FallenApple

    Exploring Gravitational Field Lines: A Classical Perspective

    I was looking for a qualitative explanation on how radiation occurs classically and came across this diagram. Which is for an accelerating charge. Then I started thinking if this break can occur for the gravitational field. Does the same thing happen for the gravitational field lines for a...
  14. H

    Calculating Pulse Transformer Frequency at Voltage

    Hi. I need some help in explaining in a simple way how to calculate the minimum allowable frequency at a certain voltage when selecting a pulse transformer. The one I'm looking at has an ET value of 45Vusec. I'm feeding it 22.5KHz at +/-6VAC square wave. It seems to work fine but I fear it is...
  15. Tiny Rick

    I Is a One-Time Use Pulse Laser Possible?

    I've been thinking... Is there any way that there could be sort of a one-time use pulse laser that uses something like a mini atomic bomb to create a super high energy laser? I found stuff about a Nuclear pumped laser and "Project Excalibur", but I wanted to ask actual people who know a lot...
  16. R

    Understanding Electromagnetic/X-Ray Pulse in Time and Frequency Domain

    Dear All, Suppose we have a electromagnetic/x-ray pulse with fixed energy with finite line width. I want to know the schematic of a plot how it looks in time- and frequency-domain? I think I understand in time domain: there will a straight vertical line on plotting intensity vs time in x-axis...
  17. R

    How to program a Pulse generator

    Hi there! is anyone here working with a pulse generator? I have Agilent 8114A Pulse generator i want to vary the frequency automatically like 1.1Hz to 10.1Hz with 1-2 secs delay. This pulse generator have a HP-IB bus at the back that can connect in a PC. Base on the Manual it can program using...
  18. SSGD

    Microcontroller Pulse Width Modulation to Analog DC Voltage

    What are some effective ways to convert a Pulse Width Modulation from a Microcontroller to a DC Voltage as a function of Pulse Width? 1. Use a low pass filter to remove the unwanted harmonics and leave only the 0th term of the Fourier Series. What produces a better DC Voltage an Active or a...
  19. T

    I Defining a pulse of particular area

    I am reading the book "Super-radiance Multiatomic Coherent Emission" by Benedict et al. and on pg. 32, they discuss the initial conditions for a particular case covered by Burnham and Chiao (1969). It mentions that the system was "excited to a state with angle ##\theta_0## by a short coherent...
  20. James Ray

    Pendulum pulse vertical flick period

    Homework Statement Homework Equations T= 2pi*sqrt(L/g) The Attempt at a Solution T= 2pi*sqrt(0.325/9.8)=1.14 s That seems like a reasonable answer. [/B]
  21. B

    Correcting Misconceptions about the Frequency of RF Pulses in MRI

    The magnetic moment of protons precesses at a frequency ω0=γB0 about the static magnetic field. In order to move the magnetisation vector into the transverse plane the RF pulse must be applied at a frequency ω0. However, as B1 (the field strength of the RF pulse) is << B1 how is this possible...
  22. ATY

    Shortest possible pulse duration

    Hey guys, I really need your help. I got the following task: "Sketch the output spectrum of a mode-locked Ti-Sapphire laser (assuming eg. gaussian shape) and calculate the shortest possible pulse duration by Fourier transformation." So the spectrum is gauss shaped but I have no clue how to get...
  23. M

    A In LIGO’s pulse, how much comes from BH merging/ inspiraling

    The inspiralling oscillations of ~20ms period (reducing to ~5ms) appear much stronger than the ringdown of ~ 3ms period (noisy, at resolution limit). Merger happens at ~440ms in the figure of Abbott et al. (Phys Res Lett link.aps.org/doi/10.1103/PhysRevLett.116.061102). This would agree with...
  24. Polkadot

    Smallest duration pulse frequency

    Homework Statement An electronic device is designed to amplify signals in the frequency range 80 MHz to 111 MHz. what is the smallest duration pulse in this frequency range that can be amplified without distortion? Homework Equations T=1/f The Attempt at a Solution the smallest duration...
  25. Chris Wallin

    A HF pulsed UV light effect on metal alloy

    I'm trying to understand the effect on a metal alloy of UV light (diode or laser) pulsing at about 1MHz. I am assuming that the stirring of atoms will generate heat, possibly moving the alloy to its eutectic point (depending on the alloy) and in particular to atomic motion. Can anyone...
  26. A

    Pulse Drying of Evaporated Milk

    Hi Guys, I'm new to the forum. I'm an engineering student studying process and chemical engineering. I am currently a member of a group that has been tasked with designing a plant to produce infant formula. The goal is to manufacture a ready-to-feed infant formula product, so that the parent...
  27. E town

    How to Build a Pulse Coil for a 13,000 Gauss Magnet?

    Hi Guys, I'm new on the forum so forgive me if this has been posted before. I'm kindly looking for some advise to build a pulse coil set up to spin a 13,00 gauss 1" diametrically magnetized magnet. I was hoping to use 120 volt rectified dc or the highest voltage that has readily available...
  28. B

    Ignition coil HV pulse on oscilloscope?

    Hi all, I've been using a HV step up transformer (10kV-20W on secondary) lately and I'm wanting to look at the HV pulses on an oscilloscope. The coil is isolated from ground. I know connecting a probe directly to it is dangerous and would ruin my scope. I want to use a differential probe but...
  29. G

    Accelerating charge emits em waves or pulse

    Does an accelerating charge, such as one turning a corner emit an em wave or just a pulse? Classical logic dictates it should just be a pulse as there is no oscillation. But which is it?
  30. R

    Fourier Transform (Triangular Pulse)

    Homework Statement What is the Fourier transform of the function graphed below? According to some textbooks the Fourier transform for this function must be: $$ab \left( \frac{sin(\omega b/2)}{\omega b /2} \right)^2$$ Homework EquationsThe Attempt at a Solution I believe this triangular...
  31. Undacuva

    Choosing a capacitor based on desired output pulse

    Hi folks, I need to get a super capacitor which will be charged by a car battery and then connected to let out a massive pulse. (Yes a bigger pulse than my 450CCA battery can give). But first I need to work out how much capacitance will be needed. I'm not sure of the formula. Thanks
  32. P

    And what the difference between waves and pulses?

    In images I always seen pulses as a part of a wave corresponding to an half of a piece of wave, but it is called still a pulse when we have a part with a complete wavelength? I mean this (in the photo) And what the difference between waves and pulses? What I think is that is still a pulse...
  33. B

    How does graded-index material reduce pulse spreading in optical fibres?

    Homework Statement [/B] The textbook is talking about pulse spreading/dispersion in optical fibres. Book says: "The spreading of the pulse is due to two dispersion effects: (i) Chromatic dispersion occurs because the refractive index of the fibre is different for different frequencies...
  34. J

    Converting w/m2 to uJ/mm2, 4usec pulse

    I need to convert light energy: 138W/m2 to uJoules / mm2, at a 4usec pulse J = W * seconds J = 138 W/m2 * 4e-6 = 5.54e-4 J/m2 5.54e-4 J/m2 = 5.54e-4 uJ/mm2 answer: 5.54e-4 uJ/mm2Does this look correct?
  35. M

    Finding Tension in a Transverse Wave on a String

    Homework Statement A transverse pulse is propagating on a 2.0 m long string of mass 50 g. The pulse is described by the equation: y(x,t)=pi/(pi+(3x/2+pi(t))^2) , with x and y in meters, and t in seconds. Find the tension in the string. Homework Equations y=asin(wt+thetha)[/B]The Attempt at...
  36. evan manalu

    Circuit inside DC boost step up pulse power module

    Any one know circuit inside DC boost step up pulse generator? I have this one buy from ebay 400Kv type,i want to know how this work by circuit inside.. I had googling and not found result.. Please help me..
  37. M

    High DC Pulse Current: Get Advice Now!

    hi dears i need your advice. i wand to produce high pulse dc current in below described circuit: - power source is lithium battery 3.6 v (limited output current, maybe 1A) - load is resistor 0.01 ohm - current by value of around 50 A during 0.001 second need to be passed from the load. -...
  38. R

    Displacement of fluid from a pulse

    Hi, The following question is related to my individual design for an engineering subject. I am trying to calculate the fluid displacement in a packed vessel when air is pulsed through a pulse leg, which is connected to the bottom of the vessel. Using equations from literature, I have...
  39. B

    Will a DC to Pulse Width Modulator work for SS Tesla Coil?

    I am making a small solid state tesla coil. I have the secondary coil, toroid and primary coil but am not sure what to do for a control circuit. I was planning on using two 9 volt batteries for power. Would a DC to Pulse Width Modulator work? This is the one I was thinking of -...
  40. S

    A pulse in a non-uniform string

    Homework Statement a non uniform string of length L and mass M, has a variable linear density given by μ=kx where k is the distance measured from one side of the string and k is a costant. a) find that M=(kL2)/2 b) show that the time t required to a pulse generated from one side of the string...
  41. jerromyjon

    Can the human ear hear a single wave pulse?

    Hi, I am referring to a pulse as one single 2π radian wave of preferably two frequencies at either end of the range. By two frequencies I mean that I would like to know if the detection of an audible continuous tone differs from their single oscillation frequency and/or intensity.
  42. M

    Pulse pass medium 1 to medium 2 Problem

    Homework Statement A pulse of length 28.7 cm is transmitted from a thin rope to a thicker rope. If the thin rope has a linear density μ1 = 0.316 g/m and the thick rope has a linear density μ2 = 1.85 g/m what is the length of the pulse in the thicker rope? Homework Equations...
  43. E

    Can a Reusable Nuclear Pulse Propelled Craft Be Made?

    Hello, my name is Alexander Radchik and I have always wanted to be an atomic play boy. Given the lack of easily obtainable fissile material I have had humble myself to the theoretical use bombs for things that make sense. Regarding my query, I have 2 questions. 1) could a reusable nuclear...
  44. S

    Calculation of the energy from a pulse

    Hello I need help for a basic question (i am awful in physics) :confused: I have two capacitors in parallel when they are charged up (18.5 kV) they release the energy to a discharge device. The discharge device releases the energy in the form of electric pulses through two electrodes in a...
  45. H

    Engineering Why is the pulse width in an RC circuit larger than expected?

    Hi, I have a question. So, I've built this simple RC circuit. Of course, the pulse width is then obtained from the oscilloscope. But, according to equation Vo(t) = E(e^(-t/RC)), the value t (pulse width) is larger. Considering the resistor, condenser, Voh, Vil, IC delay, and others, how should I...
  46. Mattman182

    High Power Pulse Propagating Through a Medium

    Homework Statement I have been given this problem but I don't think I'm doing it right as I have just disregarded n0? Calculate the maximum length of material (nonlinear refractive index n2=2.5×10-19 cm2W-1) that can be traversed if the total accumulated phase difference between the beam...
  47. A

    How can an ultrashort pulse be detected?

    How can an ultrashort pulse, such as in a time frame of femtosecond, be detected? Is it possible for a slow detector to pick up a signal in a time of femtosecond? How does an autocorrelation play a role here?
  48. F

    Determine attenuation of voltage in transmission line

    Hello, So I have a circuit where I input a square pulse with a source impedance and load impedance (which are just pure resistors) each of which can be varied and a transmission line circuit connecting them which is made up of resistors, capacitors, inductors in a lumped element model. I set...
  49. M

    I am trying to find materials to make a pulse laser for lab

    Hello everyone, I am working with my modern physics professor Dr. Parshar to make a pulse laser for my modern physics lab. I have to make an itemized expense report for the materials and all that. I need help figuring out what crystal or doped glass would be best to use, not super expensive...
  50. berkeman

    Unusual Patient -- Pulse Pressure Varying Every Few Seconds

    As part of an EMT shift at an athletic event yesterday, I took vitals on a 45y/o female Pt who had completed the stressful event about 30 minutes prior. She is very fit and experienced in athletic competition. When I was auscultating her BP, I thought that it sounded like she was skipping some...
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