The Huijue 750b Spectrometer operates on the principle of spectrophotometry, measuring light absorption by a sample to determine its concentration using the Beer-Lambert law.

Core Principle

The Huijue 750b Spectrometer functions by analyzing how a sample absorbs or transmits light at specific wavelengths. When light passes through a solution, molecules in the sample absorb certain wavelengths while allowing others to pass through. The spectrometer measures the intensity of light before and after it passes through the sample, enabling the calculation of absorbance, which is directly related to the concentration of the substance in the solution according to the Beer-Lambert law (absorbance is proportional to concentration and path length) .

Key Components and Their Roles

• Light Source: Provides a broad spectrum of light, which may include ultraviolet (UV), visible, or near-infrared (NIR) regions. Common sources include tungsten lamps for visible light and deuterium or hydrogen lamps for UV light .
• Monochromator or Spectrometer: Disperses the light into individual wavelengths and selects the desired wavelength for analysis. This can be achieved using prisms or diffraction gratings .
• Sample Holder (Cuvette): Holds the sample in a transparent container of uniform thickness, ensuring a consistent optical path length for accurate measurements .
• Detector: Measures the intensity of transmitted light and converts it into an electrical signal, which is then processed to display absorbance or transmittance values .

Operational Principle

1. The light source emits a beam that passes through the monochromator to isolate a specific wavelength.
2. The selected wavelength passes through the sample in the cuvette.
3. The detector measures the transmitted light, and the spectrometer calculates the absorbance.
4. Using the Beer-Lambert law, the instrument determines the concentration of the analyte in the sample .

Applications

The Huijue 750b Spectrometer can be used for quantitative analysis in chemistry, biology, and clinical laboratories, including measuring enzyme activity, protein concentration, and nucleic acid quantification, as well as monitoring chemical reactions . In summary, the Huijue 750b Spectrometer relies on light absorption measurement, precise wavelength selection, and the Beer-Lambert law to provide accurate quantitative analysis of samples.