种轻便的激光便携式排放测量系统PEMS用于车辆排放检测

A COMPACT ULTRA-LIGHT LASER-BASED PORTABLE EMISSIONS MEASUREMENT SYSTEM (PEMS) PLATFORM FOR VEHICLE EMISSIONS MEASUREMENTSRitobrata SurIndrioTechnologies Inc.BACKGROUNDEmissions certificationfromdynamometertesting paintsanincompletepicturePORTABLE EMISSIONS MEASUREMENT SYSTEM (PEMS)Title 40/Chapter I/Subchapter U/Part 1065/Subpart JReal World Emissions Measurements Are NeededPROBLEM WITH CURRENT SOLUTIONS -PERFORMANCEAtypicalPEMSunithttps://doi.org/10.1016/j.scitotenv.2019.136366ParameterTargetPEMS performance (CARB)Industry(PEMS)NOxLDL0.5ppm1 ppmNH3LDL0.5ppm10ppmWeight<30lbs6 lbsError<10%UnknownCross-sensitivityNoneNH3,H2O,OthersTimeresolution0.2sec5 secColdStartYesNoPROBLEM WITH CURRENT SOLUTIONS -PORTABILITYGlobal MRV, AIP MAHA, AVL, HoribaUndesirable for PEMSMissing, Ideal PEMSECM, 3DATX, PhotoVACNOx/NH3/N2O detection limitWeightLASER SPECTROSCOPY-BASED SOLUTION (FUNDAMENTALS)Gas cellLightsourceDetectorWindowsPhoton (e = hν)EnergyhνSPECIFIC MODES OF VIBRATION –MOLECULE-SPECIFICSPEC