Paper 1-IS-35 / A NEW UV SENSOR METHOD FOR SEWER RENOVATION Page 1

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2 Paper 3-B-01 / Cured in Place Pipeliners A New UV Sensor Method for Sewer Renovation Michael Roeling, Export Manager BKP Berolina Polyester GmbH & Co. KG, Velten, Germany Page 2

3 UV Curing of CIPP since 1986 becoming more and more popular within the last 15 years good quality control online possible spectrum used: 350 nm 450 nm (UVA to visible blue) Page 3

4 Quality Managements steps at the installation site Data recording with PC Copyright: BKP Page 4

5 Quality Managements steps at the installation site Data recording with PC control mode lamp started lamp switched on on/off of winch lamp defect lamp switched off lamp not activated Copyright: BKP Page 5

6 [ C] [cm/min] [bar] Quality Managements steps at the installation site Data recording with PC evaluation 70 0,8 60 0,7 0,6 50 0, Air temperature [ C] 30 0,4 120 Laminate temperature 2 [ C] Laminate temperature 1 [ C] Curing speed [cm/min] 0,3 air pressure [bar] , , : : : : : : : : : : : : : :28 Copyright: BKP Page 6

7 Overview: objective quality proof optical measurement evaluation process optimization optical sensor host pipe light source CIPP-Liner Source: OSSCAD Page 7

8 light Principal configuration of UV-light measuring Transmission measuring: UV collimation device optical fiber wavelength selective receiver transmission measuring spectrometer Lateral UV-light launching: no UV collimation device special optical fiber wavelength selective receiver lateral light launching light light Source: OSSCAD spectrometer New: measuring the UV light by lateral launching it into optical fibers! Page 8

9 Mathematical model of UV light measuring light P P E _ S E _ S ( L ( L A A,, ) ) P ST S e 2( S s A A N ) L A l P k e 2( s A ) L A P ST P E_S P E_S : received power with lateral launching P ST : stray power related to the interaction length e: Euler s constant S: stray coefficient of sensor fiber A: absorption coefficient of sensor fiber : central wave length of light S: catch factor AN: numerical aperture l: length of interaction : lateral launch efficiency P k : optical power (outer core area) L A : length of sensor fiber Source: OSSCAD Page 9

10 Spectral attenuation of optical fibers standard fibers Composition of a step index fiber typical data of quartz fibers: for single mode fibers for multi mode fibers Source: Page 10

11 Spectral attenuation of optical fibers standard fibers Spectral attenuation behavior of standard fibers area of UV light wavelength range: 800nm to 1600nm composition of fiber: Cladding: 125µm, SiO2 quartz glass Core: 50µm, Ge-SiO2 Germanium doped quartz glass Coating: 250µm, UV resistant material Standard fibers are not usable for measuring UV light! Source: OSSCAD Page 11

12 Optical characteristics of special fibers plastic optical fiber (POF) Spectral attenuation behavior of POF Attenuation In comparison with quartz fibers POF have: higher path attenuation (absorption) less temperature resistance Wave Length POF are not usable for measuring UV light! Source: OSSCAD Page 12

13 Use of a UV transparent coating Development of a UV resistant fiber with UV transparent coating. Spectrum used for UV-curing Wavelength range: 200nm to 800nm Composition of glass fiber: Cladding: 220µm, F-SiO2 Fluorine-doped quartz glass Core: 200µm, SiO2 quartz glass Coating: 260µm, UV transparent material Source: OSSCAD Page 13

14 Spectral distribution of UV- light source (mercury vapor lamp): Spectrum used for UV-curing Page 14

15 15 Laboratory test test set-up Liner sample: L=50cm (20 ), ID=300mm (12 ), wall thickness=4.3mm optical fiber connector 25cm L=15-20cm UV-light source UVASPOT 400T optoelectronic measuring device Source: OSSCAD 20m - UV patch cable amplifier µp optical fiber connector photodiode TCP/IP Interface USB Spectrometer Page 15 evaluation

16 Test with site simulation test set-up Page 16

17 UV-measuring with UV-filter and automatic amplification light chain 8 UV-lamps Integral transmission curve of sensor cable as a function of time Liner fully cured UV-measuring test: September 30th 2010 length of sensor cable: 1m test 1 Start of curing process Ignition of lamps All lamps ON Light chain moves towards sensor cable Conditions: - curing speed: 67cm/min - all 8 UV lamps On - UV lamp (bulb 17cm, center 10cm) - distance between lamps: 17cm - length of light chain: 2,48m Page 17

18 UV-measuring with UV-filter and automatic amplification light chain with lamps 1+2 and 7+8 only Integral transmission curve of sensor cable as a function of time Start of curing process when UV lamps 1+2 pass by Liner fully cured after passage of UV lamps 7+8 UV-measuring test: September 30th 2010 length of sensor cable: 1m test 2 Conditions: - curing speed: 33cm/min -UV lamps On - UV lamp (bulb 17cm, center 10cm) - distance between lamps: 17cm - length of light chain: 2,48m Page 18

19 Laboratory test sample for calibration Page 19

20 Laboratory test sample for calibration Page 20

21 Thank You For Your Attention! BKP Berolina Polyester GmbH & Co. KG Heidering Velten Germany Phone: +49 (3304) Fax: +49 (3304) Web: Page 21

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