{"id":13293,"date":"2014-02-07T20:49:36","date_gmt":"2014-02-07T20:49:36","guid":{"rendered":"http:\/\/www.mometrix.com\/academy\/?page_id=13293"},"modified":"2026-05-01T11:42:26","modified_gmt":"2026-05-01T16:42:26","slug":"spectrophotometers","status":"publish","type":"page","link":"https:\/\/www.mometrix.com\/academy\/spectrophotometers\/","title":{"rendered":"What is a Spectrophotometer?"},"content":{"rendered":"\n\t\t\t<div id=\"mmDeferVideoEncompass_e9yrLF1jT8E\" style=\"position: relative;\">\n\t\t\t<picture>\n\t\t\t\t<source srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2023\/01\/circle-play-duotone.webp\" type=\"image\/webp\">\n\t\t\t\t<source srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2023\/01\/circle-play-duotone.png\" type=\"image\/jpeg\"> \n\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" loading=\"eager\" id=\"videoThumbnailImage_e9yrLF1jT8E\" data-source-videoID=\"e9yrLF1jT8E\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2023\/01\/circle-play-duotone.png\" alt=\"What is a Spectrophotometer? 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It does this by measuring the intensity of <a class=\"ylist\" href=\"https:\/\/www.mometrix.com\/academy\/light\/\">light<\/a> as a beam of light passes through the sample solution.<\/p>\n<p>The basic principle is that each compound absorbs or transmits light over a certain range of wavelength. This measurement can also be used to measure the amount of a known chemical substance.<\/p>\n<h2><span id=\"Components_of_a_Spectrophotometer\" class=\"m-toc-anchor\"><\/span>Components of a Spectrophotometer<\/h2>\n<p>\nBefore we go any further, let\u2019s look at the different components that make up a spectrophotometer.<\/p>\n<h3><span id=\"Light_Source\" class=\"m-toc-anchor\"><\/span>Light Source<\/h3>\n<p>\nFirst, there\u2019s a light source. The light source typically produces white light, which is made of all the colors in the rainbow, but it could produce light outside of the colors we can see, such as ultraviolet light or infrared light. We know what the light source can produce by looking at the spectral bandwidth, which tells us the range of wavelengths.<\/p>\n<p>The light is directed to a diffraction grating or prism\u2014sometimes called a <strong>monochromator<\/strong>\u2014which spatially separates the light into its spectrum.<\/p>\n<h3><span id=\"Variable_Wavelength_Selector\" class=\"m-toc-anchor\"><\/span>Variable Wavelength Selector<\/h3>\n<p>\nThe separated colors then hit a slit\u2014sometimes called a variable wavelength selector\u2014which allows a specific range of <a class=\"ylist\" href=\"https:\/\/www.mometrix.com\/academy\/diffraction-of-light-waves\/\">wavelengths<\/a> to shine on the sample. This range is adjusted either by tilting the monochromator or by moving the slit.<\/p>\n<p>In either case, the accuracy of the spectrophotometer\u2019s measurements depend on how narrow of a range of wavelengths the slit allows through. For the most accurate measurement, the range needs to be very small.<\/p>\n<h3><span id=\"Sample_Compartment\" class=\"m-toc-anchor\"><\/span>Sample Compartment<\/h3>\n<p>\nThe next basic part of a spectrophotometer is the sample compartment, which holds the sample where the light can shine on it. The sample may absorb some of the light, but the light that gets through the sample is collected by a detector.<\/p>\n<p>The detector tells us how much light was measured for the range of wavelengths the slit allowed through. This measurement tells us what makes up the sample and other important material properties.<\/p>\n<h2><span id=\"How_to_Use_a_Spectrophotometer\" class=\"m-toc-anchor\"><\/span>How to Use a Spectrophotometer<\/h2>\n<p>\nNow that we\u2019ve covered the basics, let\u2019s briefly discuss how to use the spectrophotometer.<\/p>\n<p>First, the sample compartment is emptied so that a <strong>reference spectrum<\/strong> is collected. This tells us how much light the light source is creating.<\/p>\n<p>Then the sample is placed in the container, the light interacts with the sample, and the amount of light absorbed is calculated by comparing this measurement to the reference measurement.<\/p>\n<h2><span id=\"SingleBeam_vs_DoubleBeam\" class=\"m-toc-anchor\"><\/span>Single-Beam vs. Double-Beam<\/h2>\n<p>\nSpectrophotometers come in many different shapes and sizes, but there is one particular difference I want to mention: a single beam and double beam spectrophotometer.<\/p>\n<p>We just discussed a single-beam spectrophotometer, where we have to take a reference spectrum and then put our sample in the spectrophotometer. There is only one beam of light and one detector.<\/p>\n<p>A double-beam spectrophotometer uses two beams to compare a reference spectrum to the sample\u2019s spectrum at the same time! The double beam may be created using a mirror, where the mirror quickly switches between the reference and the sample. In this case, there is still only one detector.<\/p>\n<p>Another way to create a double beam is to separate out the light into two beams using another prism. Half the light goes to the reference and half the light goes to the sample. This way requires two detectors.<\/p>\n<p>Double beam spectrophotometers are more expensive than their single beam counterparts. However, you can use a double beam spectrophotometer to save time when performing experiments and help ensure the data are reproducible.<\/p>\n<p>Thanks for watching and happy studying!<\/p>\n<\/div>\n<\/div>\n\n<div class=\"home-buttons\">\n<p><a href=\"https:\/\/www.mometrix.com\/academy\/experimental\/\">Return to Environmental Videos<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Return to Environmental Videos<\/p>\n","protected":false},"author":1,"featured_media":186284,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":{"0":"post-13293","1":"page","2":"type-page","3":"status-publish","4":"has-post-thumbnail","6":"page_category-science-equipment-videos","7":"page_type-video","8":"subject_matter-science"},"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 4.9.8 - aioseo.com -->\n\t<meta name=\"description\" content=\"Spectrophotometers determine how much light is absorbed and are used for determining the amounts of a known chemical substance. 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