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