In the present invention, the spot converged at the cell interrogation zone of the flow chamber is flattened to avoid instability of the fluid which in {HEAD ~ turn} leads to {TAIL ~ instability} of the excited optical signal, and consequently the stability and reliability of the system are improved 
In the present invention , the spot converged at the cell interrogation zone of the flow chamber is flattened to avoid instability of the fluid which in { HEAD ~ turn } leads to { TAIL ~ instability } of the excited optical signal , and consequently the stability and reliability of the system are improved
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