Radiant intensity power

Radiant energy Radiant flux or power Radiant intensity... 

Radiant intensity can be described as the amount of power (watt) heading in your direction, i.e., per steradian, from a light source. The total amount of power emitted by the source is the radiant flux (watt). If you integrate the radiant intensity over all solid angles, you get the total radiant flux. If it is weighted by the photopic response, then it is the luminous intensity and the luminous flux. 

Temperatures estimated from the measured intensity distributions at each port location during an 02/Ar oxidizer run in the 24-inch long combustor are plotted in Fig. 8.4, along with the measured hemispherical emissive power in the wavelength range from 425 to 800 nm. (The hemispherical emissive power, E, is related to the radiant intensity, /, by = ttI. Radiant intensity is also referred to as radiance.) The stoichiometry, 0/F)/ 0/F)st, for this run was about f.fO. The measured combustion temperature was about 2900 K, as compared to an adiabatic flame temperature of about 3650 K. The intensity measurements indicate that ignition occurs about 12 in. downstream from the injector. The intensity is near its peak at the most downstream port location, which indicates that combustion is still underway at that location. 

I. In reference to a spectral feature, the scalar or magnitude of that feature. 2. Chromatic purity. 3. The magnitude of a particular force or energy per unit (e.g., surface, charge, mass, time, volume, etc.). 4. Synonym for photon irradiance. 5. Synonym for fluence rate. 6. Synonym for irradiance illuminance. 7. Synonym for radiant power. 8. Symbohzed by /, synonym for radiant intensity. 9. See Magnetic Field Strength. 10. See Electric Field Strength. 

The radiant intensity (I) is a measure of radiometric power per unit solid angle Q (Q = A/ r2), expressed in watts per steradian (W sr-1). The value of the solid angle Q is numerically equal to the size of that area divided by the square of the radius of the sphere. For hand-held NIR flares one wants a reasonable bum time (ca. 45 s), a high concealment index X which is defined as the ratio of the radiant intensity in the near IR region (/NIR, 700-1000 nm) over the radiant intensity in the visible region (IvIS, 400 700 nm) and high radiant intensities in the NIR regions /j(600 900 nm) and /2(695 1050) ... 

Intensity refers to a property of a source e.g., light intensity designates the rate of light emission for a photometric source (lumens per unit solid angle, or candelas), and radiant intensity is the power emitted per unit solid angle (W steradian-1). 

Radiant intensity is the power emitted per unit of solid angle of the source, whereas radiance is the intensity per unit area of the source. Thus, a fluorescent lamp has intensity similar to a filament lamp, but a comparatively low radiance. 

Radiant intensity (I) Radiant (energy) flux or radiant power, P, per unit solid angle, to. The SI unit is W sr. ... 

Cell edge efficiency is the efficiency of the photovoltaic cell at the actual edge power density, edge emission wave-length and edge radiant intensity distribution of the LSC. 

The angular divergence of the output from a 1-W argon laser is assumed to be 4 X 10 rad. Calculate the radiance L and the radiant intensity / of the laser beam and the irradiance I (intensity) at a surface 1 m away from the output mirror, when the laser beam diameter at the mirror is 2 mm. What is the spectral power density p v) if the laser bandwidth is 1 MHz ... 

QJ Radiant intensity 7e = A e/A72 times solid angle Power/solid angle watt/steradian W/sr... 

Radiant Flux and Intensity. The quantity 0 is the power emitted by a radiation source, measured in watts (W). This quantity is measured by photometric detectors. The power incident on a surface d P/dA (in W m ) is commonly called the intensity (with a non-standardized imit I), although this is not correct. The correct SI notation is irradiance (symbol E). It should not be confused with the radiant intensity I, the power per imit solid angle (in W sr ). 

If several transitions E. - Ej from the same upper level E. to different lower levels are possible, the radiant powers of the corresponding spectral lines are proportional to the Einstein coefficients A j. The relative radiant intensities in a certain direction may also depend on the spatial distribution of the fluorescence, which can be different for the different transitions. 

Mass Absorption Coefficients. Radiation traversing a layer of substance is diminished in intensity by a constant fraction per centimeter thickness x of material. The emergent radiant power P, in terms of incident radiant power Pq, is given by... 

Of historical interest is Tyndall s observation, made so long ago as 1865, that gases with an odour possess the power of absorbing radiant heat to a marked degree. Grijns - in 1919 was not able to detect any relation between the intensity of the odour and its power of absorbing radiant heat, and he therefore concluded that the stimulation of the olfactory apparatus is not effected by the liberation of energy absorbed from radiant heat. 

On the basis of this equation it can be seen that the radiant power of atomic fluorescence signal is directly proportional to the concentration of the ground state atoms and to the radiant power of the exciting radiation. Therefore, increasing the intensity of the incident beam will improve the sensitivity of the technique. 

The radiant power of a beam is designated by its intensity of radiation, which in turn is directly proportional to the number of photons per second that are propagated in the beam. 

The term intensity is commonly used but is imprecise. According to IUPAC recommendations (see Pure 6[ Appl. Chem. 68, 2223-2286 (1996)), this term should be replaced by the spectral radiant power Ph i.e. the radiant power at wavelength X per unit wavelength... 

Band intensities are expressed as either transmittance (T) or absorbance (A). Transmittance is the ratio of the radiant power transmitted by a sample to the radiant power incident on the sample. Absorbance is the base 10 logarithm of the reciprocals of the transmittance A = logi0T. Quantitative measurements in the infrared usually begin with Beer s law and its analogs ... 

UV Irradiance is the radiant power arriving at a surface per unit area. The most commonly used unit of irradiance is W/cm. It varies with lamp output power, efficiency, the focus of its reflector system, and its distance to the surface. The intense peak of focused power directly under the lamp is referred to as peak irradiance. Although not a defined term, intensity is occasionally used to refer to irradiance. Irradiance... 

Irradiance is the energy per unit time per unit area in the light beam (watts per square meter. W/m2). The terms intensity or radiant power have been used for this same quantity. 

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