Laser device helps researchers measure depih of oil slicks by Pippa B. Wysong Special to The Review Being able to detect how thick an oil slick is can help in the clean-up of oil spills. Louis Lalu- miere, an electrical engineer with Canpolar Inc. of Toronto, is devel- Foping ways to use lasers to deter- mine the thickness of an oil slick. Although his research is still in its infancy, Lalumiere says labora- fory tests have indicated the laser t@hnique is very accurate. Oil thicknesses ranging from three centimetres down to 320 microns (thousandths of a millimetre) were measured. He says that knowing the depth of a slick helps clean-up crews figure out how much oil has spil- led and how much dispersant — a substance that causes oil to break up into small globules — they should use. “When a spill first occurs, it can be a metre to 10 centimetres thick. It’s just come out of the ship and it’s thick,” Lalumiere said. The slick thins over time as it spreads out. : “Within a few minutes or an hour, it’s-down to about one centi- metre. After five to six hours, it’s down to about one millimetre to one-tenth of a millimetre.” He is working on a technique called laser interferometry, which requires the use of two lasers that would be mounted on a helicopter. “One excites the oil with an acoustic pulse and the other laser y detects the pulse inside the oil “slick,” he says. Both lasers are aimed at the same spot on the surface of the oil slick. The first laser sends high energy light pulses into the slick at sa rate of up to 50 times a second. When these pulses hit the surface of the slick, they create sound waves. Lalumiere explains that the energy from the laser light is transferred into sound by local heating when it hits the water. “We're talking about the con- Aversion of energy from the laser into sound waves.” m The sound waves that have been reated travel as vibrations from hen bounce back up to the sur- @ the slick can be used to deter- mine how deep the slick is. The researchers can determine the travel time of the sound wave by using the second laser, which signal. It detects vibration at the surface caused by the sound waves bouncing back. « Ray Headtic x emits a continuous, not a pulsed MLS $144,500 MLS Rose covered cottage with a difference. This property has three bedrooms, has been tastefully redecorated and it has definite redevelopment possibilities. Best of both worlds awaits your atten- tion, live-in charm and comfort while you await the inevitable. A most sunny and cheerful home with a flat gardening lot and a separate garage. Sur- rounded by sidewalks to everywhere. 388-6275 (1934) e top of the slick to the bottom, | 4544 Station A, Victoria, B.C. V8X 3X4 MOTHERS’ MARCH ~ ASUCCESS The Kinsmen Mothers’ March Annual door-to-door fund-raising Campaign for 1990 has just concluded and in conjunction with special events has been extremely successful in surpassing the goal of $250,000. Around 3700 dedicated volunteer marchers canvassed the Capital Regional District between January 15 & 31, 1990. The dedication of these marchers, together with the support and co-operation given by members of the community and generous sponsors, made this goal possible. The Kinsmen Mothers’ March is the main source of funding for the Kinsmen Rehabilitation Foundation of B.C. which helps provide children and adults with physical disabilities to achieve independ- ence. they also provide funding for the purchase of necessities such as crutches, wheelchairs and leg braces, which are not covered by B.G.’s Medical Plan. For those people who have not yet made their contribution to the Mothers’ March Campaign for this year, donations are still being accepted and can be mailed to:- Kinsmen Mothers’ March, PO. Box BECAUSE OF YOU.....1T WORKS! TheReview Wednesday, April 4,1990 — A23 CUB, SCOUT AND BEAVER worked together Sunday at Blue Heron Park in Sid- ney, planting about 600 fir and cedar trees as part of the Scouf movements Earth Day Project. Cub Fraser Campbell, 11, is joined by (-) Beaver Jer trey Duncan, 7, and Scout . Darren Robinson, J1, from the 10th Tsartlip Scout group. Three scouting ands Funeral Chapels 656-2932 or 388-5155 Offer a complete choice of Professional Services. — TRADITIONAL groups from the Greater Victoria area gathered — MEMORIAL with a total of about 60 || — DIRECT CREMATION scouts to plant the five- — FULL year-old trees, under the PRE-ARRANGEMENTS direction of members of the Memorial Park Society, who look after Blue Heron Park. Some Trees were put around the new picnic area while others were put around the edge of future ball fields. GLENN WERKMAN photo SERVICES Services from your church or in either of our chapels at 1803 QUADRA STREET VICTORIA DISTRICT OF NORTH SANNICH SPRING CLEAN - UP PROGRAMME COMMENCING APRIL 17, 1990 l’'s Spring Cleaning time again — our annual programme com- mences April 17th this year The aim Is to enhance the beauty of our District by removing nuisance material from public and private property at no individual expense. Information on this programme can be obtained by referring to the pamphlet which will be circulated by mail or by phoning the Municipal Hall: NORTH SAANICH 656-0781 Your Council and Staff are enthusiastic about this project. Please pitch in and co-operate in the elimination of litter and junk in our Municipality. = Mayer Linda Michaluk TOWN OF SIDNEY NOTICE The Council of the Town of Sidney intends to adopt the following bylaw amending the Zoning Bylaw No. 750 as indicated:- Zoning Amendment Bylaw No 1009 To rezone the following properties from - “A-Residential” to “C.1 Commercial-Residential” for the purpose of development of a commerical-residential complex consisting of 89 residential units and 13,200 sq ft. of commercial space. Lots 1 to 5, Section 11, range 3 East, Plan 17474 SAAMES SV | S52 |55 |\54 | 35) 5¢ PLOLOSELD ALEA OF LEZOVING SHOWN HATCHED Copy of the amending bylaw may be inspected at the Town Hall on regular business days (excepting holidays) between the hours of 8:30.a.m. and 4:00 p.m. from April 2nd, 1990 to April 18th, 1990., Any persons who deem their interests may be affected by the plans of the proposed development should submit their comments in writing to the undersigned no later than 4:00 p.m. April 20th, 1990. (Note: This is the same notice as previously published, but is re-issued due to Council not dealing with the Bylaw on Ithe date originally intended.) G.S. Logan, A.C.1.S., PAdm., C.M.C. Administrator Town of Sidney 2440 Sidney Avenue Sidney, B.C., V8L 1Y7