Two types of photometers are used: spectrophotometer and filter photometer. In spectrophotometers a monochromator (with prism or with grating) is used to obtain monochromatic light of one defined wavelength. In filter photometers, optical filters are used to give the monochromatic light.
What is the most common type of photometer?
Luminance and illuminance meters are the most common photometers and are easily available as turnkey systems. Luminous flux meters and luminous intensity meters are not widely available and usually have to be customized to the specific light measurement application due to the geometry of measurement involved.
What is a photometer in chemistry?
Photometry is the measurement of light absorbed in the ultraviolet (UV) to visible (VIS) to infra-red (IR) range. Photometers utilize a specific light source and detectors that convert light passed through a sample solution into a proportional electric signal.
What is photometer principle?
The principle of spectrophotometers and filter photometers is that (as far as possible) monochromatic light is allowed to pass through a container (cell) with optically flat windows containing the solution.
What is a photometer in laboratory?
A photometer is a tool used to measure light, and photometry is how light is measured. Photometers can measure electromagnetic radiation, which is the energy that can be found in different forms including x-rays, gamma rays, ultraviolet light, and visible light (among others).
What is a photometer in clinical chemistry?
Specifically, photometers can measure ultraviolet to infrared on the electromagnetic spectrum, which includes visible light. Photometry is used in chemistry to help identify what materials are in substances. Due to the Beer-Lambert Law , the more solutes in a solution, the more light will be absorbed.
What is a photometer used for in biology?
photometer. (Science: apparatus, physics) An instrument for measuring the intensity of light, or, more especially, for comparing the relative intensities of different lights, or their relative illuminating power.
What is the application of photometer?
Photometers are made in many forms for various applications. They may be used directly, as in photography or in measuring glare, colour variation, reflectance, or other qualities, or they may be incorporated into such devices as densitometers, spectrographs, and telescopes.
What is the principle of absorbance photometry?
Spectrophotometry is a method to measure how much a substance absorbs light by measuring the intensity of light as a beam of light passes through sample solution. The basic principle is that each compound absorbs or transmits light over a certain range of wavelength.
What is photometer is used for?
photometer, device that measures the strength of electromagnetic radiation in the range from ultraviolet to infrared and including the visible spectrum.
How does a photometer measure light?
Most photometers detect the light with photoresistors, photodiodes or photomultipliers. To analyze the light, the photometer may measure the light after it has passed through a filter or through a monochromator for determination at defined wavelengths or for analysis of the spectral distribution of the light.