{"id":11190,"date":"2020-03-14T02:03:33","date_gmt":"2020-03-14T06:03:33","guid":{"rendered":"https:\/\/sensing.konicaminolta.us\/us?post_type=light_measurement&#038;p=11190"},"modified":"2020-03-20T17:43:51","modified_gmt":"2020-03-20T21:43:51","slug":"radiometry-spectroradiometry-photometry","status":"publish","type":"light_measurement","link":"https:\/\/sensing.konicaminolta.us\/us\/learning-center\/light-measurement\/radiometry-spectroradiometry-photometry\/","title":{"rendered":"Radiometry, Spectroradiometry and Photometry"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row row_height_percent=&#8221;0&#8243; override_padding=&#8221;yes&#8221; h_padding=&#8221;2&#8243; top_padding=&#8221;0&#8243; bottom_padding=&#8221;1&#8243; overlay_alpha=&#8221;50&#8243; gutter_size=&#8221;3&#8243; column_width_percent=&#8221;100&#8243; shift_y=&#8221;0&#8243; z_index=&#8221;0&#8243;][vc_column width=&#8221;1\/1&#8243;][uncode_block id=&#8221;11162&#8243; inside_column=&#8221;yes&#8221;][\/vc_column][\/vc_row][vc_row row_height_percent=&#8221;0&#8243; override_padding=&#8221;yes&#8221; h_padding=&#8221;2&#8243; top_padding=&#8221;2&#8243; bottom_padding=&#8221;0&#8243; overlay_alpha=&#8221;50&#8243; gutter_size=&#8221;3&#8243; column_width_percent=&#8221;100&#8243; shift_y=&#8221;0&#8243; z_index=&#8221;0&#8243;][vc_column width=&#8221;1\/1&#8243;][vc_custom_heading heading_semantic=&#8221;h1&#8243; text_size=&#8221;h3&#8243; separator=&#8221;yes&#8221; separator_color=&#8221;yes&#8221;]Radiometry, Spectroradiometry and Photometry[\/vc_custom_heading][\/vc_column][\/vc_row][vc_row row_height_percent=&#8221;0&#8243; override_padding=&#8221;yes&#8221; h_padding=&#8221;2&#8243; top_padding=&#8221;1&#8243; bottom_padding=&#8221;2&#8243; overlay_alpha=&#8221;50&#8243; gutter_size=&#8221;3&#8243; column_width_percent=&#8221;100&#8243; shift_y=&#8221;0&#8243; z_index=&#8221;0&#8243; css=&#8221;.vc_custom_1584168100992{padding-top: 20px !important;}&#8221;][vc_column column_width_percent=&#8221;100&#8243; gutter_size=&#8221;2&#8243; overlay_alpha=&#8221;50&#8243; shift_x=&#8221;0&#8243; shift_y=&#8221;0&#8243; shift_y_down=&#8221;0&#8243; z_index=&#8221;0&#8243; medium_width=&#8221;0&#8243; mobile_width=&#8221;0&#8243; width=&#8221;1\/2&#8243;][vc_column_text el_class=&#8221;text-block&#8221;]<strong>Radiometry<\/strong>[\/vc_column_text][vc_single_image media=&#8221;11192&#8243; media_width_percent=&#8221;70&#8243; alignment=&#8221;center&#8221;][vc_column_text]<strong>Radiometry is the science of the measurement of electromagnetic (EM) radiation. The broader spectrum covered by the science of radiometry is based on physical constants.<\/strong><\/p>\n<p>The properties of concern to us here are radiated power and its spatial and angular distributions.<\/p>\n<p>The four basic concepts are:<\/p>\n<ul>\n<li>Radiant Flux<\/li>\n<li>Radiant Intensity<\/li>\n<li>Radiance<\/li>\n<li>Irradiance<\/li>\n<\/ul>\n<p><strong>Radiant Flux<\/strong><br \/>\nThis is the total radiant power emitted from a source or received by a surface. It can also be defined as the rate of flow of radiant energy through a certain area or out of a certain solid angle. The SI unit of radiant flux is the Watt.<\/p>\n<p><strong>Radiant Intensity<\/strong><br \/>\nIt is defined as the directed angular density of radiation from a source. The radiant intensity in a given direction is the sum of the power contained in all the rays (cones) emitted in that direction by the entire source (i.e., power per solid angle). The SI unit for radiant intensity is Watt\/Steradian (Watt\/sr).<\/p>\n<p><strong>Irradiance<\/strong><br \/>\nThis is a measure of radiant flux incident on an object\u2019s surface (radiant flux per unit area). The SI units for irradiance is Watt\/square meter (Watt\/m2)<\/p>\n<p><strong>Radiance<\/strong><br \/>\nThis is a measure of the total radiant intensity per unit projected area. The SI units for radiance is Watt\/square meter Steradian (Watt\/m2 sr)[\/vc_column_text][vc_single_image media=&#8221;11195&#8243; media_width_percent=&#8221;70&#8243; alignment=&#8221;center&#8221;][vc_column_text el_class=&#8221;text-block&#8221;]<strong>Spectroradiometry<\/strong>[\/vc_column_text][vc_column_text]<strong>Spectroradiometry is the measurement of light energy at individual wavelengths within the electromagnetic spectrum. It can be measured over the entire spectrum or within a specific band of wavelengths.<\/strong><\/p>\n<p><strong>Spectral Radiance<\/strong><br \/>\nThe radiance of a light source is a single value which is the sum of all energy measured over a spectrum. The individual energy values at a particular wavelength in nanometer (nm) can be determined by a spectral radiance measurement. The SI units for spectral radiance is Watt\/square meter Steradian nanometer (Watt\/m2 sr nm).<\/p>\n<p><strong>Spectral Irradiance<\/strong><br \/>\nThis is a measure of the total radiant intensity per unit projected area. The SI units for spectral irradiance is Watt\/square meter nanometer (Watt\/m2.nm)[\/vc_column_text][\/vc_column][vc_column column_width_percent=&#8221;100&#8243; gutter_size=&#8221;2&#8243; overlay_alpha=&#8221;50&#8243; shift_x=&#8221;0&#8243; shift_y=&#8221;0&#8243; shift_y_down=&#8221;0&#8243; z_index=&#8221;0&#8243; medium_width=&#8221;0&#8243; mobile_width=&#8221;0&#8243; width=&#8221;1\/2&#8243;][vc_column_text el_class=&#8221;text-block&#8221;]<strong>Photometry<\/strong>[\/vc_column_text][vc_single_image media=&#8221;11198&#8243; media_width_percent=&#8221;70&#8243; alignment=&#8221;center&#8221;][vc_column_text]<strong>Photometry involves measurement of the psychophysical attributes of electromagnetic energy that is visible to the human eye. The use of the term \u2018luminous\u2019, which refers to visible light, defines photometry in terms of human perception.<\/strong><\/p>\n<p>Photometry becomes a modern science in 1942, when Commission Internationale de l\u2019Eclairage (CIE) met to define the response of the average human eye. CIE measured the light-adapted eyes of a sizeable sample group, and compile the data into the CIE Standard Luminosity Function (widely known as photopic curve \u2013 chromatic perception at normal state, and scotopic curve \u2013 achromatic perception at low level of illuminance. \u2013 see Fig.2.3a).<\/p>\n<p>The photometric quantities are related to the corresponding radiometric quantities by the CIE Standard Luminosity Function. We can think of the luminosity function as the transfer function of a filter which approximates the behaviors of the average human eye (Fig. 2.3b).[\/vc_column_text][vc_single_image media=&#8221;11201&#8243; media_width_percent=&#8221;70&#8243; alignment=&#8221;center&#8221;][vc_column_text]Photometry consists of four basic concepts, namely the luminous flux, luminous intensity, illuminance, and luminance.<\/p>\n<p><strong><img decoding=\"async\" class=\"alignright size-full wp-image-11207\" src=\"https:\/\/sensing.konicaminolta.us\/wp-content\/uploads\/lc-light-luminous-flux.jpg\" alt=\"Luminous Flux\" width=\"179\" height=\"190\" \/>Luminous Flux<\/strong><br \/>\nA source of light radiates energy in the form of electromagnetic waves. We speak of light energy as \u2018flux\u2019 and luminous flux is a measure of the flow of light energy emitted by a source, or received by a surface.<\/p>\n<p>The quantity is derived from the radiant flux, W (in Watts), by evaluating the radiation in accordance with the relative luminous efficiency of the \u2018standard eye\u2019 (CIE Standard Luminosity Function, V*).<\/p>\n<p>The unit is lumen (lm).<\/p>\n<p>lm = 6 83 x W (Watt) x V*<\/p>\n<p><img decoding=\"async\" class=\"alignright size-full wp-image-11204\" src=\"https:\/\/sensing.konicaminolta.us\/wp-content\/uploads\/lc-light-luminous-intensity.jpg\" alt=\"Luminous Intensity\" width=\"168\" height=\"185\" \/><\/p>\n<p><strong>Luminous Intensity<\/strong><br \/>\nThis expresses the power of a light source. It is defined as the quantity of luminous flux emitted in a given direction per solid angle (in steradian).<\/p>\n<p>The unit is candela (cd). 1 cd = 1 lumen per steradian. (For practical purposes, one candela power.)<\/p>\n<p><strong>Illuminance<\/strong><br \/>\nThis is a measure of the concentration of luminous flux falling upon a surface.<\/p>\n<p>It is expressed in lumens per unit area.<\/p>\n<p>The unit is lux (lx).<br \/>\n1 lx = 1 lumen per square meter (lm\/m2)<br \/>\nThe original non-metric British unit is the foot-candle.<br \/>\n1 foot-candle = 1 lumen per square foot (lm\/ft2)[\/vc_column_text][vc_single_image media=&#8221;11210&#8243; media_width_use_pixel=&#8221;yes&#8221; alignment=&#8221;center&#8221; media_width_pixel=&#8221;250&#8243;][vc_column_text]<strong>Luminance<br \/>\n<\/strong>Also known as photometric brightness, luminance is a measure of the flux emitted from, or reflected by, a relatively flat and uniform surface. Luminance may be thought of as luminous intensity per unit area.<\/p>\n<p>The unit is candelas per square meter (cd\/m2), or nit.<br \/>\nThe original non-metric British unit is the footlambert (fL)<br \/>\n1 fL = 1 candela\/*ft2[\/vc_column_text][vc_single_image media=&#8221;11213&#8243; media_width_use_pixel=&#8221;yes&#8221; alignment=&#8221;center&#8221; media_width_pixel=&#8221;220&#8243;][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"featured_media":0,"template":"","class_list":["post-11190","light_measurement","type-light_measurement","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.4 (Yoast SEO v24.4) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>Radiometry, Spectroradiometry and Photometry | Konica Minolta Sensing<\/title>\r\n<meta name=\"description\" content=\"Konica Minolta Sensing explains the differences between radiometry, spectroradiometry, and photometry and defines several 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