1、 Excitation Core: Inductively Coupled Plasma Light Source

The plasma generator is the 'heart' of the instrument. When high-frequency current passes through the induction coil, an alternating magnetic field is formed inside the quartz torch tube, and argon gas is ionized into plasma under the action of radio frequency energy (temperature up to 6000-10000K). This high-temperature environment can decompose sample molecules, atomize elements, and excite them to high-energy states, releasing photons of characteristic wavelengths during transitions. The stability of plasma directly affects the accuracy of analysis, and modern instruments ensure discharge stability through automatic power regulation and airflow optimization.

2、 Sample Conversion: Precise Control of Nebulizer

The atomization system plays the role of a 'sample bridge'. Pneumatic atomizers use high-speed argon gas flow to tear liquid samples into micrometer sized droplets, of which only about 2% of fine droplets can pass through the fog chamber and enter the plasma, while large droplets are eliminated. The ultrasonic atomizer generates more uniform droplets (particle size can be as low as 1 μ m) through piezoelectric crystal vibration, significantly improving transmission efficiency. The swirling design of the fog chamber further screens mist droplets to ensure good representativeness of the samples entering the plasma.

3、 Spectral Capture: Multidimensional Analysis of Detection Systems

The excited atomic emission light is focused by a lens and enters the spectroscopic system. The two-dimensional dispersion device composed of a mid step grating and a prism can separate the full spectrum of 160-800nm in a single exposure, and achieve full spectrum direct reading with CCD or CID detector. The detector converts the optical signal into an electrical signal, eliminates background interference through pulse height analysis technology, and finally outputs element concentration data. The intelligent calibration system equipped with modern instruments can compensate for matrix effects in real time, ensuring ppb level detection limits.

In the closed-loop system from atomization to detection, various components work together to achieve the 'three highs' characteristics of elemental analysis: high sensitivity (detection limit up to ng/L level), high selectivity (spectral resolution better than 0.01nm), and high throughput (dozens of element measurements completed per minute). This technology system, which integrates efficient stimulation, precise conversion, and intelligent detection, continues to play a key role in environmental monitoring, food safety, and other fields, becoming a decoding tool for micro world element maps.