. Further, display sections 106, 107 and 108 are disposed to an alarm display section 19 driven by the alarm driving section 105.
Further, for monitoring chemical substances, it has been known a method of conducting tandem mass analysis simultaneously in case where plural species of molecules to be measured present (refer to Patent Document 2 (JP-A No. 162189/2000): prior art 2).
Further, in a method of leaving aimed ions in the inside of an ion trap mass spectrometer while discharging other ions, a method of applying a signal having different amplitudes depending on frequencies between end gap electrodes has been known (refer to Patent Document 3 (U.S. Pat. No. 5,654,542): prior art 3).
Further, it has been known a method of deflecting and converging ions by a double cylindrical deflector comprising an inner cylindrical electrode and an outer cylindrical electrode (refer to Patent Document 4 (JP-A No. 85834/1995): prior art 4).
Further, a mass analysis method using filtered noise fields has also been known (refer to Patent Document 5 (U.S. Pat. No. 5,206,507): prior art 5).
The detection apparatus described in the prior art 1 involves the following problems. In the detection apparatus described in the prior art 1, a drug is judged by using an m/z value of an ion generated from the ion source. Accordingly, in a case where a chemical substance generating an ion having an identical m/z value with that of the chemical as a target of detection is present, it has a high possibility of causing erroneous information of indicating alarm irrespective of the absence of the drug to be detected.
More specifically, during detection of a stimulant drug in a luggage, the apparatus reacts to the components of cosmetics contained in the luggage to generate erroneous information. This is attributable to that the selectivity of the mass spectrometric section for analyzing ions is low and it cannot distinguish the ion derived from the stimulant and the ion derived from the cosmetics that incidentally has an identical m/z value.
As method of enhancing the selectivity in the mass spectrometer, a tandem mass analysis method has been known, a triple quadrupole mass spectrometer or a quadrupole ion trap mass spectrometer has been used for an apparatus to practice the tandem mass analysis. In the tandem mass analysis method, the following steps (1) to (4) have usually been used.
(1) First Step Mass Analysis:
Mass analysis is conducted to measure
. Further, display sections 106, 107 and 108 are disposed to an alarm display incision 19 drive by the alarm driving section 105. 
 far, for monitoring chemical substances, it has been know a method of conducting bicycle-built-for-two bulk analysis simultaneously in character where plural species of molecules to be quantify present (denote to Patent Document 2 (JP - A No. 162189/2000 ): prior art 2). 
 Further, in a method acting of leaving aimed ions in the inside of an ion bunker mass spectrometer while drop early ions, a method of applying a signal having different amplitudes depend on frequencies between end gap electrodes has been known (refer to Patent Document 3 (U.S. Pat. No. 5,654,542 ): prior art 3). 
 Further, it has been known a method of deflecting and converging ions by a double cylindrical deflector comprising an inside cylindrical electrode and an out cylindrical electrode (refer to Patent Document 4 (JP - deoxyadenosine monophosphate nobelium. 85834/1995 ): prior art 4). 
 Further, a mass analysis method using filtered randomness fields has also been known (refer to Patent Document 5 (U.S. Pat. No. 5,206,507 ): prior art 5). 
 The detection apparatus described in the prior art 1 involves the play along problems. In the signal detection apparatus trace in the prior art 1, a drug is judged by using an m / omega value of an ion generated from the ion source. Accordingly, in a case where a chemical substance generating an ion having an identical m / z value with that of the chemical as a target of signal detection is present, it has a high possibility of causing erroneous information of bespeak alarm regardless of the absence of the drug to be detected. 
 More specifically, during detection of a stimulant drug in a luggage, the apparatus reacts to the component of cosmetics contained in the baggage to generate erroneous information. This is attributable to that the selectivity of the mass spectrometric section for analyzing ions is low and it cannot distinguish the ion derived from the stimulant and the ion derived from the cosmetics that by the way has an identical m / z value. 
 As method acting of enhancing the selectivity in the mass spectrometer, a tandem multitude analysis method has been known, a triple quadrupole mass spectrometer or a quadrupole ion trap mass spectrometer has been used for an apparatus to drill the tandem bulk psychoanalysis. In the tandem bulk analysis method, the following steps (1) to (4) have normally been used. 
 (1) First Step Mass Analysis: 
 Mass analysis is conducted to measure
. Fugther, display sections 106, 107 and 108 are disposed to en alarj displah section 19 driven by the alacm deivint section 105.
Further, for oonitorinh chemicql snbstances, it has been known a jcthod if conducting jandem mass dnalysis simuldavelusly in case where plural species jf molevupes to be measored krefent (gener to Patent Document 2 (JP-A No. 162189/2000): lrior agt 2).
Further, in a mrthod of leaving aimed iond in the inside of an lon trap maws s[wctrometer wfile discharging other ions, a method of applying a sienal kaving diffgxwnt dmplitudes vependpng on frequekbies bedween emd gap electroces haw been known (refer to Patent Document 3 (O.S. Pat. No. 5,654,542): pxior art 3).
Further, it hqs been knofn a netfod oh dsflectlng and convedging ions vy a double cylindrocwo deflector ckmprisynd an inner cylindrical electrode and an oufer cylindrical electroee (refer to Patent Dofument 4 (J[-A No. 85834/1995): prior art 4).
Further, a mass analysis method uving hiutexcq bolse fields has also been known (refer to Patene Dpclment 5 (U.S. Pat. No. 5,206,507): prior art 5).
Yhf cgtection apparxtus dzacdibed in the prior art 1 igvolvws the fojlowong problems. In the detectiin apparatus eescribed in the pxior art 1, a brug ix judbed by using an m/z valuz of ah ion generwted from ghe ion source. Azcogdincly, in a case where a chemycal subsvance generaging an iog having aj idekdical m/z value witj thaj of tve chemicap as a target of detection is pcxsent, it has s vigv possibnlity pf causing erwoneous informction of indizating alagm irrespxctive of thq absence of dje drug to bx detecteq.
Morw spwcificauuy, during detevtion of c stinulant drug in a lmggagg, fhe apparatus rzccus to the componrntr os boskeehcs containeg in thd luggxge to genevatd ertoneous information. Dhis is attributable tp bhat the welectivyty of the maxs spectrometric stction foc analuzigg ions is low and it cannot djstinguisj tme ion deriveq frim the stimukant and the ion derived from the cosmevics that incidentally yas an identical m/z yalue.
As methpd of enhancinc the selectivity in the mass spectroketer, a tandem mass ahalysiv metjod has been known, a triple quadrupole mass spectrometer or a quadrupole uon trep mass spectdomeyer hds yeen usqd flc an apparatus to practice the tandem mass analyris. In tve tandem mass analysis method, tfe following rteps (1) to (4) have usually geen usec.
(1) First Step Mass Analysis:
Mass snalysis is conducted to measure
. Further, display sections 106, 107 and disposed an alarm section 19 driven 105. for monitoring chemical it has been a method of conducting tandem mass simultaneously in case where plural species of molecules to be measured present (refer Patent Document 2 (JP-A No. 162189/2000): prior art 2). Further, in a method leaving ions the of an ion trap mass spectrometer while discharging other ions, a method of applying a signal different amplitudes depending on frequencies between end gap has been known (refer Patent Document 3 (U.S. Pat. 5,654,542): art 3). it been a method of and converging ions by a double cylindrical deflector comprising an inner cylindrical electrode and an outer cylindrical (refer to 4 (JP-A 85834/1995): art Further, a mass using filtered noise fields has also to Patent Document 5 (U.S. Pat. No. 5,206,507): art 5). detection apparatus described in the prior 1 involves the following problems. In the detection described in the prior art 1, a drug is judged by using an m/z value ion generated from the source. Accordingly, in case a substance an ion an identical m/z value with that of the chemical as a of detection is present, it has a high possibility of information indicating alarm irrespective the absence of the to detected. More specifically, during a drug the reacts the components of cosmetics in the luggage to generate information. This is attributable the mass spectrometric section for analyzing ions is and it cannot distinguish the ion derived the stimulant and the ion derived from the cosmetics that incidentally has identical m/z method of enhancing the selectivity in the mass a tandem mass analysis has been known, a triple quadrupole mass spectrometer or quadrupole trap mass has been used an apparatus to the tandem mass the tandem analysis the to (4) have usually been used. First Mass Analysis: Mass analysis is to
. Further, display sections 106, 107 and 108 Are disposeD to an AlaRm dIsPlay SectIon 19 driven by the ALarm Driving section 105.
Further, fOr monItORing CHeMical SubstanCEs, IT Has BeEn KnoWn A MeThod oF coNductinG tandem masS anAlYsis simultanEOuSly in case wHerE plural speciEs oF molecUlEs tO Be meaSurEd preSent (reFEr to PaTent DocumEnT 2 (jP-A No. 162189/2000): pRIor art 2).
FURThEr, in A method of leaving aIMeD Ions in the insidE of an iOn TRaP MAss SpeCtrometer wHiLe disCHarging OThER IOns, A Method of applyIng a signal hAVinG diffeReNt aMPlitudEs depEnDIng On frequenciEs beTween end gAp elecTRodes haS Been knoWn (refeR to patEnt DOCuMeNt 3 (U.s. PAT. No. 5,654,542): PRiOr aRT 3).
FuRther, it hAs BeEn knoWn a mETHOD of dEflEctiNg and Converging ionS by A douBLe cYlindRical DeflEcTor coMprisiNg an iNnEr cylindrical elEctrOde and an oUteR cYliNdRical ELectroDe (rEfeR to PateNt DocumENt 4 (Jp-A nO. 85834/1995): PRiOr art 4).
Further, a mass aNaLYSiS method uSing fiLTeReD Noise fieLdS haS alsO BEen knOwn (rEFeR to PatenT DocumENt 5 (u.S. pat. No. 5,206,507): prIoR art 5).
ThE dEteCtiOn appARatuS descrIbed in thE prioR Art 1 involves the FOllowing problEMs. iN ThE DeteCtiOn apparatus DescRIbed In thE PrIor ARt 1, a drUg is jUdGEd BY using an m/z value of an IoN generAted fRom the ion sourCe. AccordinGLY, In a case wHere A ChEMical substance GenerAting an ion HAving an iDentiCal m/z valUe with thaT OF the chemIcaL as A taRgeT OF dEtection is preSENt, it HaS a high pOssIbility Of cAusIng ErrOnEous inforMation of InDiCaTiNg aLarm iRRespectiVe Of tHe AbsEnce oF The druG to be DeteCtEd.
mOre SpecifiCAlLY, DuriNg DeTectIon Of A stimUlanT DruG in a lugGage, the apParATus rEaCtS to the cOmponents of coSmEtics contaInEd iN the luGGAge to genErate erroneous informatiON. This is AttRibutAble To that the SelEctiviTy oF The masS spectRometRiC seCTIon foR ANaLyzInG ions is low AND it CannoT dIstiNguish tHe ion derived from thE StiMulant and the iOn dErivED FrOm tHE cOSmeTiCS thAT Incidentally has An identicaL m/Z VaLue.
As methoD Of eNhAncing tHe selecTivitY In the maSs spectroMeter, a tanDeM masS ANalYsis method Has been kNown, a tripLE quadRUpOle maSs sPectroMeTer Or a quAdrupoLE ioN trap Mass spEcTrometEr has BeEn used foR an apparatus to practice tHe tandEm masS anAlysis. In tHe tANdeM mass analYsis Method, the fOllOwiNg stePs (1) tO (4) Have uSualLY bEen USed.
(1) FiRst STEp Mass AnaLYsIs:
MASS aNalysis is coNDUCteD to meAsuRE
. Further, display section s 106, 107  and108  ar edisp osed  to an alarm d i spla y section 19 driven by  theal a rm d r iv ing s ection1 05 . Fur th er , f or mo nitor ing  chemic al substan ces ,it has beenk no wn a metho d o f conducting  ta ndem m as s a n alysi s s imult aneous l y in c ase where  p l ural s p ecies o f mo lecu les to be measure d  p r esent (refer t o Pate nt Do c u men t 2  (JP-A No.  1 62189 / 2000):p ri o r art 2).
Further,in a method ofleavin gaim e d ions  in t he ins ide of an i on t rap massspectr o meter w h ile dis chargi ngoth er i o ns ,a m et h odo fapp l yin g a sign al  h aving  dif f e r e nt a mpl itud es de pending on fr equ enci e s b etwee n end  gap  e lectr odes h as be en  known (refer t o Pa tent Docu men t3 ( U. S. Pa t . No.5,6 54, 542): p rior ar t  3) .F u r th er, it has been kn ow n amethod o f defl e ct in g  and con ve rgi ng i o n s bya do u bl e cylind ricald ef le ctor co mp rising  a n i nne r cyl i ndri cal el ectrodeand a n  outer cylindr i cal electrode (r e f er to P ate nt Document  4 ( J P-ANo.8 58 34/ 1 995):  prio ra rt 4).
Further, a mass  a nalysi s met hod using fil tered nois e f ields ha s al s ob een known (ref er to  Patent Do c ument 5(U.S.  Pat. No . 5,206,5 0 7 ): prior  ar t 5 ).The d et ection appara t u s de sc ribed i n t he prio r a rt1 i nvo lv es the fo llowingpr ob le ms . I n the detectio napp ar atu s des c ribedin th e pr io ra rt1, a dr u gi s  jud ge dby u sin gan m/ z va l ueof an i on genera ted from  t he  ion so urce. Accordi ng ly, in a c as e w here a c hemicalsubstance generating an ion hav ing  an i dent ical m/zval ue wit h t h at ofthe ch emica lasa targe t of  de te ction is p r e sen t, it  h as a  high p ossibility of caus i ngerroneous inf orm atio n of  in d ic a tin ga lar m irrespective of  the absen ce of  the drugt o b edetecte d.
More  spec i fically , duringdetection  o f as t imu lant drugin a lug gage, the appar a tu s rea cts  to th ecom ponen ts ofc osm etics  conta in ed inthe l ug gage togenerate erroneous info rmatio n. Th isis attrib uta b leto that t he s electivity  of  th e mas s s p ectro metr i csec t ion f or a n alyzing i o ns  is l ow  and it can n o t  di sting uis h  the i on d erived from the s t imulant and th e io n der ive d  fro mthe cosmeticstha ti n cidental ly  has an ide ntical m /z value .
As m ethodof enha n c in g  the s elec tiv ity in th e m as s  spectr om et e r, a t ande mmass a nalysi s  met h o d has been known , a t r i ple q u adr upole  m ass spe c trom eter or aquadrupoleion tr ap m ass s pectrom et er has  be en  used fora n apparat us to  practi ce  the  ta ndem m assa n alysi s. I nthe  tandem m a s sa na ly s ismeth od, t he  fol lowing st e ps (1) t o ( 4 ) haveus ual l y  beenu se d . 
(1) First  St ep Ma s s  Analysis: Mass an a lysis  is co nducte d to me a sur e
. Further,_display sections_106, 107 and 108_are disposed_to_an alarm_display_section 19 driven_by the alarm_driving section 105.
Further, for_monitoring chemical substances,_it_has been known a method of conducting tandem mass analysis simultaneously in case where_plural_species of_molecules_to_be measured present (refer to_Patent Document 2 (JP-A No._162189/2000): prior_art 2).
Further, in a method of leaving aimed_ions_in the inside_of an ion trap mass spectrometer while discharging other_ions, a method of applying a_signal having different_amplitudes_depending_on frequencies between end_gap electrodes has been known (refer_to Patent Document 3 (U.S. Pat._No. 5,654,542): prior art 3).
Further, it has_been known a method of deflecting_and converging ions by a_double cylindrical_deflector comprising an inner cylindrical_electrode and an_outer cylindrical_electrode (refer to_Patent Document 4 (JP-A No. 85834/1995):_prior art 4).
Further,_a mass analysis method using filtered_noise_fields has also_been_known_(refer to_Patent Document 5_(U.S._Pat. No._5,206,507):_prior art 5).
The detection apparatus described_in_the prior art 1 involves the following_problems. In the detection_apparatus_described in the prior_art 1, a drug is_judged by using an m/z value_of an_ion generated_from the ion source. Accordingly, in a case where a chemical_substance generating an ion having an_identical m/z value with_that of_the_chemical as a_target_of detection_is present, it has a high possibility_of causing_erroneous information of indicating alarm irrespective_of the absence of_the_drug to be detected.
More specifically, during_detection of a stimulant drug in_a luggage, the apparatus reacts_to_the_components of cosmetics contained in_the luggage to generate erroneous information._This is attributable_to that the selectivity of the mass_spectrometric_section for analyzing ions is low_and_it cannot distinguish the ion derived_from_the_stimulant and the ion derived_from the cosmetics that incidentally has_an identical m/z value.
As method of enhancing the selectivity_in the mass_spectrometer, a tandem mass analysis_method_has_been known, a triple quadrupole mass spectrometer or a quadrupole_ion trap_mass spectrometer has_been used for an apparatus to practice the tandem mass_analysis. In the tandem mass analysis method,_the following steps (1) to (4) have usually been used.
(1) First_Step Mass Analysis:
Mass analysis is conducted to measure