DSO54-No2 Light Gate.qxp - Serrata Science Equipment

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SmartTECHNOLOGYQLight GatePractical InformationMeasure the length of the object or interrupt card that passes through theinfrared beam or the distance between two Light Gates as accurately aspossible. If measurements are not accurate all the calculated data will besystematically high or low. This measurement can be the most critical part ofthe investigation.Note: A value of one decimal place can be entered in the Recording wizard in the Timer program. If avalue with two decimal places is entered it will automatically be ‘rounded up’ to one decimal place.e.g. If 3.36 is entered then this value will be rounded up to 3.4. If measurements taken areconsistently high then reduce this value to 3.3.The segment length of a double interrupt card is used twice when calculating‘Acceleration at A’ so any measurement error will be doubled. If two LightGates are used to calculate acceleration - ‘Acceleration from A to B’ – theinterrupt card’s length is only used once to calculate the final velocity so theresults should be more accurate.When measuring the distance from oneLight Gate to another either measure:a. From the detection line of one LightGate to the detection line of the otherorb. The leading edge of one Light Gateto the leading edge of the other.baDetection lineUsing a long interrupt card e.g. 10cm,will improve the accuracy of results.Light Gate ALight Gate BIf you are measuring the diameter of an object thatis going to be dropped through a Light Gate makesure you measure the part that will actually passthrough the beam.If two Light Gates are used make sure they arealigned to each other (positioned in parallel, withback edges lined up so the void of one Light Gateis in line with the void of the other Gate). This iseasier to achieve if the same size bosshead isused to secure each Gate.Hint: We found it useful to mount the two Light Gates on a flatstrip of metal or wood, 23mm wide, slotted between the tworidges located in the centre portion of the Light Gate and screwedin place using two M6 x 12mm Pozidriv pan-headed screws.7
SmartTECHNOLOGYQLight GateTry to arrange the set-up so the object passes as close to the receiver (theslot) as possible. This reduces any possibility of a shadow changing theeffective length of the object e.g. an interrupt card.The best material for interrupt/timing cards would be rigid, coloured black andhave tidy parallel edges. Some users find that equal amounts of plasticine orBlutack used on each of the lower corners of the interrupt card will lower thecentre of gravity and make the card more stable and less likely to wobble whendropped.Ensure that the object/interrupt card cuts cleanly through the Light Gate’sinfrared beam. If it twists at all discard the result.Ensure that the bottom of an object(e.g. an interrupt card) does notinterrupt the Light Gates beambefore the object is released.Hold the card centrallyUse the support rod to clamp theLight Gate in position. Holding aLight Gate in your hand will giveinaccurate results.If you are dropping an interruptcard through the Light Gate, holdthe card centrally from the samestart position just above the Gate.ReceiverTransmitterIf masses or plasticine areattached to the interrupt card makesure they do not protrude beyondthe edges of the card. Massesshould be balanced to prevent thecard from twisting as it travels.Example: To apply a weight of 20g, use 2 x 10g weights positioned at each side of the interrupt card.2 x 10gweights8
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DSO54-No2 Light Gate.qxp - Serrata Science Equipment

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