Sentences with phrase «use photometers»
Astronomers (professional or amateur) can measure a star's brightness (the amount of light it puts out) by using a photometer or charge - coupled device (CCD) on the end of a telescope.
https://science.howstuffworks.com/ Not exact matches
«The photometers that lamp manufacturers use for calibrating their devices have been produced and calibrated for incandescent lamps, which results in errors when measuring the efficacy of LEDs.
Using an instrument called a photometer, which measures brightness very accurately, researchers can detect those dips and — from their duration and frequency — can deduce the size of the exoplanet and its orbit.
Kepler uses a very wide field telescope and a photometer (light meter) to measure brightness variations in more than 156,000 stars simultaneously [source: Ames Research Center, NASA Finds Earth - size Planet Candidates].
Ten of these reports were from observers using electronic equipment - video cameras and photoelectric photometers.
Herschel invented a photometer («astrometer» as he called it) that allowed the observer to visually compare the brightness of stars using a scale based on the reduced telescopic image of the Moon.
In 1839, the French astronomer Dominique François Jean Arago proposed the design of a new photometer using photographic principles.
In the case of a star, for example, a photometer can be used to determine its temperature, its distance and even its age.
Abstract: We report on mid - and far - IR Spitzer observations of 7 nearby dusty elliptical galaxies by using the Multiband Imaging Photometer (MIPS) and Infrared Spectrograph (IRS).
In order to study the origin and the propertie... ▽ More We report on mid - and far - IR Spitzer observations of 7 nearby dusty elliptical galaxies by using the Multiband Imaging Photometer (MIPS) and Infrared Spectrograph (IRS).
Arctic Black Carbon Loading and Profile Using the Single - Particle Soot Photometer (SP2) Field Campaign Report.
FIREX - Related Biomass Burning Research Using ARM Single - Particle Soot Photometer Field Campaign Report.
Measurements from ground - based sun photometer networks can be used both to provide a ground - truth validation of satellite aerosol retrieval sand to produce a land - based aerosol climatology which is complementary to satellite retrievals that currently are being performed mostly over ocean.
AAOD is derived by AERONET, a ground - based network of instruments called sun photometers that are used to calculate how much aerosols block the sun's energy as it passes through the atmosphere, and also from an Aura satellite instrument known as OMI.
* Operate and maintain calorimeters, computer - controlled analyzers, flame photometers, spectrophotometers, and other equipment used in qualitative or quantitative analysis.
• Well versed in using and maintaining medical technology tools such as chemistry analyzers, laboratory dilutors and photometers.