We all know that immunoassay analyzer is widely used in daily life, so do you know what role QSI laser diode mainly plays in it? Let's take a look at it together.

Use of immune analyzer

Excited fluorescent marker

For example, in sandwich method and competition method, antibodies or antigens are labeled with fluorescent reagents, which will produce fluorescence with a specific wavelength when irradiated by laser. The instrument finally judges the content of protein, hormone and virus antigen in the sample according to the fluorescence intensity.

Do optical path collimation and colorimetric detection.

Some immune analyzers (especially small POCT equipment) will use laser to do weak transmission detection to see the change of color or turbidity of the reaction solution.

Participate in optical positioning or fluid imaging.

In flow immunoassay, laser is used to "sweep" the reaction particles and detect the number of fluorescent labels on the particles.

The laser must be stable. Steady enough to repeat the same output in minutes.

Why do immunoanalyzers like to use QSI laser diodes?

The light intensity is particularly stable and does not beat.

Immunoassay is biochemical analysis, not cutting processing, and is extremely sensitive to light intensity fluctuation.

The LD of QSI usually adopts low noise structure, and the current ripple is also extremely low, so the stability of optical signal is very good.

The central wavelength is stable and will not drift.

Fluorescence excitation has a characteristic that the laser wavelength should match the excitation peak of fluorescein.

If the wavelength is a few nanometers away, the intensity may drop a lot.

The light spot is round and the pattern is clean

Immunoanalyzers basically use filters and diaphragms. If the laser mode is chaotic and the speckle is large, the sensitivity will be seriously affected.

Long life, not easy to decline

Unlike industrial equipment, medical equipment can be stopped and replaced casually, and hospitals have particularly high requirements for stability.

QSI LD performs well in the long-term operation of immune analyzer.

The above brief introduction to you is the application of QSI laser diode in immune analyzer, hoping to bring you some help.