| 摘要 |
PROBLEM TO BE SOLVED: To provide a fine particle detection system capable of preventing detection in a state that detection accuracy is lowered and accurately detecting the amount of fine particles.SOLUTION: A fine particle detection system 1 for detecting the amount of fine particles in measured gas EG comprises a detection part 10, drive circuits 210, 240, and control parts 230, 202. The detection part 210 includes an ion source 11 and a fine particle charging part 12. The drive circuits 10 includes an ion source drive circuit 210 for performing constant current control so that an aerial discharge current Id supplied to the ion source 11 becomes a predetermined target current. The control parts 230, 202 include: current convergence determination means for determining, after the ion source drive circuit 210 has started operations of the ion source 11, whether the aerial discharge current Id supplied by the ion source drive circuit 210 has converged within a predetermined allowable range including the target current; and detection start means for starting, after the aerial discharge current Id has converged within the allowable range, the detection of the amount of fine particles using signals Is detected by a detection circuit 230. |
