Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Constant Pressure Calorimetry03:02

Constant Pressure Calorimetry

89.7K
Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...
89.7K
Constant Volume Calorimetry02:41

Constant Volume Calorimetry

28.9K
Calorimeters are useful to determine the heat released or absorbed by a chemical reaction. Coffee cup calorimeters are designed to operate at constant (atmospheric) pressure and are convenient to measure heat flow (or enthalpy change) accompanying processes that occur in solution at constant pressure. A different type of calorimeter that operates at constant volume, colloquially known as a bomb calorimeter, is used to measure the energy produced by reactions that yield large amounts of heat and...
28.9K
Calorimetry01:19

Calorimetry

3.4K
When objects at different temperatures are placed in contact with each other but isolated from everything else, they attain thermal equilibrium. A container that prevents heat transfer in or out is called a calorimeter, and the use of a calorimeter to make measurements is called calorimetry. Generally, these measurements involve heat or specific heat capacity. The term "calorimetry problem" is used for any problem where the specified objects are thermally isolated from their...
3.4K
Flame Photometry: Overview01:02

Flame Photometry: Overview

907
Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
907
Flame Photometry: Lab01:16

Flame Photometry: Lab

464
In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
464

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Enthalpy and Heat-Capacity Standard Reference Material: Synthetic Sapphire (α-Al<sub>2</sub>O<sub>3</sub>) from 10 to 2250 K.

Journal of research of the National Bureau of Standards (1977)·2021
Same author

Early prognosis of respiratory virus shedding in humans.

Scientific reports·2021
Same author

Relative Enthalpy of Solid Beryllium Aluminate (Chrysoberyl), BeO · Al<sub>2</sub>O<sub>3</sub>, from 1175 to 2025 K, and of Liquid Beryllium Aluminate from 2170 to 2350 K.

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry·2020
Same author

Disaccommodation of Magnetic Spectra of Two Manganese Zinc Ferrites.

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry·2020
Same author

Heat Exchange in Adiabatic Calorimeters.

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry·2019
Same author

c-Met-induced epithelial carcinogenesis is initiated by the serine protease matriptase.

Oncogene·2011

Related Experiment Video

Updated: Oct 19, 2025

Laser-heating and Radiance Spectrometry for the Study of Nuclear Materials in Conditions Simulating a Nuclear Power Plant Accident
09:18

Laser-heating and Radiance Spectrometry for the Study of Nuclear Materials in Conditions Simulating a Nuclear Power Plant Accident

Published on: December 14, 2017

10.6K

A Reference Calorimeter for Laser Energy Measurements.

E D West1, W E Case1, A L Rasmussen1

  • 1Institute for Basic Standards, National Bureau of Standards, Boulder, Colorado 80302.

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry
|September 27, 2021
PubMed
Summary
This summary is machine-generated.

This study details a method for measuring laser energy and power using electrical standards and an isoperibol calorimeter. The described calorimeter offers precise measurements with minimal systematic error, crucial for laser applications.

Keywords:
Calorimetrylaserlaser calorimetrylaser energy measurementlaser power measurement

More Related Videos

A Simple Dewar/Cryostat for Thermally Equilibrating Samples at Known Temperatures for Accurate Cryogenic Luminescence Measurements
06:06

A Simple Dewar/Cryostat for Thermally Equilibrating Samples at Known Temperatures for Accurate Cryogenic Luminescence Measurements

Published on: July 19, 2016

9.7K
Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
07:17

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

Published on: August 1, 2017

12.9K

Related Experiment Videos

Last Updated: Oct 19, 2025

Laser-heating and Radiance Spectrometry for the Study of Nuclear Materials in Conditions Simulating a Nuclear Power Plant Accident
09:18

Laser-heating and Radiance Spectrometry for the Study of Nuclear Materials in Conditions Simulating a Nuclear Power Plant Accident

Published on: December 14, 2017

10.6K
A Simple Dewar/Cryostat for Thermally Equilibrating Samples at Known Temperatures for Accurate Cryogenic Luminescence Measurements
06:06

A Simple Dewar/Cryostat for Thermally Equilibrating Samples at Known Temperatures for Accurate Cryogenic Luminescence Measurements

Published on: July 19, 2016

9.7K
Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
07:17

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

Published on: August 1, 2017

12.9K

Area of Science:

  • Metrology and Measurement Science
  • Optical Engineering
  • Applied Physics

Background:

  • Accurate measurement of laser energy and power is critical for scientific research and industrial applications.
  • Existing methods may have limitations in precision, range, or ease of use.
  • Establishing traceable standards for laser energy and power is essential for inter-laboratory comparisons and calibration.

Purpose of the Study:

  • To describe principles and procedures for measuring laser energy and power traceable to electrical standards.
  • To detail the construction and performance of a novel isoperibol calorimeter for laser measurements.
  • To evaluate the accuracy and precision of the developed measurement system.

Main Methods:

  • Utilized voltage, resistance, and frequency standards for energy and power calibration.
  • Constructed a small isoperibol calorimeter with specific thermal insulation properties.
  • Performed comparative measurements using two calorimeters and a beam splitter to assess precision.
  • Determined systematic error limits for the calorimeter.

Main Results:

  • The isoperibol calorimeter accommodates laser energy from 0.01 to 20 J and continuous wave (cw) power from 4 × 10-5 to 1 W.
  • Maximum pulse intensity is limited to 0.1 J/cm2.
  • Standard deviation for comparison measurements was 0.08 percent for energy inputs ≥ 0.3 J.
  • Estimated systematic error limits are ± 1.0 percent of the measured laser energy.

Conclusions:

  • The described method provides a reliable and accurate means of measuring laser energy and power traceable to electrical standards.
  • The isoperibol calorimeter demonstrates high precision and low systematic error, suitable for a defined range of laser parameters.
  • This work contributes to the standardization and metrology of laser energy and power measurements.