Definition of visible spectrometer

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Photonics Dictionary

visible spectrometer: A visible spectrometer is an analytical instrument used to measure the intensity of light in the visible spectrum, typically ranging from about 400 to 700 nanometers (nm). It is used to analyze the optical properties of materials by examining how they absorb, transmit, or reflect visible light.

Function: The visible spectrometer quantifies the light intensity at different wavelengths within the visible spectrum. This information is used to determine various properties of a sample, such as its composition, concentration, and color.

Components:

Light source: Provides a stable beam of light that covers the visible spectrum. Common sources include tungsten-halogen lamps or LEDs.

Monochromator: Disperses the light into its component wavelengths and selects a specific wavelength to pass through the sample. This is usually done with a prism or diffraction grating.

Sample holder: The location where the sample is placed for analysis. The light passes through or reflects off the sample, depending on the measurement type.

Detector: Measures the intensity of light after it interacts with the sample. Photodiodes or charge-coupled devices (CCDs) are commonly used detectors.

Processor/display: Converts the detected light intensity into a spectrum or a specific measurement and displays the result, often as a graph of absorbance, transmittance, or reflectance versus wavelength.

Applications:

Chemical analysis: Determining the concentration of specific compounds in a solution by analyzing the absorption characteristics of the sample.

Color measurement: Quantifying the color of materials in industries such as paint, textiles, and food.

Quality control: Monitoring the consistency and quality of products by analyzing their optical properties.

Environmental monitoring: Measuring pollutants or other substances in water or air based on their absorption spectra.

Importance: Visible spectrometers are essential tools in laboratories and industries for qualitative and quantitative analysis of materials. They provide valuable information about the chemical and physical properties of substances by analyzing how they interact with visible light, leading to insights in research, quality control, environmental monitoring, and more.

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