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eltima electronic Jokie 2, Руководство пользователя

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eltima electronic Jokie 2 Скачать руководство пользователя страница 18

Taking pictures with Jokie²

Finding the midpoint of the reflector

Next you should look for the midpoint of the reflector and

direct the light barrier towards it. In order to do so, you

swing the light barrier slowly towards the right until the

LED is on again – please remember this point. Afterwards

you turn the light barrier left, until the light beam is be-

yond the reflector and the LED is on. The horizontal mid-

point is in the middle of these two points.
Now, starting from the horizontal midpoint, you also align

the light barrier towards the vertical midpoint. You will find

the latter as described above, only this time in the vertical

direction.

Connecting the camera

At this point the light barrier is aligned, so that you can

connect the camera. After that the system is prepared and

ready to take pictures – the camera will be released if the

light beam is interrupted.

Important camera settings

Auto-focus

When photographing with light barriers it is mandatory to

switch the auto-focus of the camera to manual. By not do-

ing this, the camera will probably not release.

This principle applies for all operating modes of the light

barrier.
Reason:   The   auto-focus   is   too   slow   for   the   most   high-

-speed situations, even though now days systems are al-

ready very fast. The light barrier replaces the auto-focus!
Focus the lens to a point were you expect that your sub-

ject may be, when the camera takes the picture. The sub-

jects speed, the moving direction as well as the cameras

lag time must be taken in account.
According to the speed and the lag time of the camera, the

subject will travel a certain distance away from the beam.

The right focus point has to be determined by a number of

trials.

18

© eltima electronic 2013

Содержание Jokie 2

Страница 1: ...User s Manual light barrier ...

Страница 2: ...Ver 1 0 3 ...

Страница 3: ...ription of components eltima electronic 2013 3 velcro tape tripod socket infrared transmitter camera socket operating mode switch 80 mm reflector DC plug battery case 40 mm reflector LED receiver DC plug potentiometer light barrier ...

Страница 4: ...er 17 Finding the midpoint of the reflector 18 Connecting the camera 18 Important camera settings 18 Auto focus 18 Aligning the camera towards the camera and the subject 19 Focal plane parallel to light beam 19 Focal plane parallel to flight path 20 Using the geometry of the subject 20 Working with the sensitivity of the light barrier 21 Taking pictures of small objects 21 Blanking out of smaller ...

Страница 5: ...elease photo graphic cameras flashes and filming devices Please do only use it for this purpose Symbols Symbol for tips concerning the handling of the de vice Important advice concerning the function of the de vice Important advice to prevent damage of the device or connected devices Maintenance and storage is not waterproof and therefore neither suitable for use in rain nor under water Please con...

Страница 6: ...it available as accessories into the camera socket Position the light barrier and the reflector opposite to each other at a distance of 60 80 cm Note This distance is chosen randomly and it is neither the shortest nor the largest possible dis tance between camera and reflector Align the infrared beam towards the reflector until the LED goes out The light barrier is ready for use now Plug the other...

Страница 7: ... the way of the light beam an electrical switch is closed and the connected device is released This principle of function offers several advantages First of all only one device the light barrier itself needs power supply the other side the reflector is passive In addition the latter is very solid and easy to handle at tach and camouflage Furthermore it is possible to use any object as reflector fo...

Страница 8: ...beam of 3 5 mm The objects to be detected be the light barrier need to meet and interrupt this beam The small diameter brings a very precise and repeatable switching point of the light barrier The sensitivity of the system is highest in the green area In the orange area closer to the reflector the sensitivity decreases and it s not sure that smaller objects will be de tected In the blue area that ...

Страница 9: ...tion it came from shifted for an edge length Image 8 shows the principle of function of a single triple prism Due to this characteristic a retroreflector does in contrast to plane mirrors not have to be aligned exactly into the direction of the light barrier It is totally sufficient when it looks roughly towards the latter Solely for reaching the maximum working distance the reflector should be al...

Страница 10: ... in order to weaken the light beam to such an extent that the amount of light will be below the threshold value The larger the working distance the more light intensity is lost before getting back to the receiver and therefore the amount of received light is closer to the threshold Here a small object will be enough as well in order to weaken the light beam so that the amount of light will fall be...

Страница 11: ...g in four possible sections of reach Table 1 roughly shows the coherence Switch position small small small large sarge small sarge large Reach minimum small high maximum Minimum size of object very small small medium large Sensitivity maximum high small minimum Power of IR sender minimum small high maximum Table 1 Effect of different switch settings The operating mode switch can be turned with a p...

Страница 12: ... small small 1 3 small large 8 large small 12 large large 16 Table 2 Maximum reach for different sizes of reflectors The following tables show how the sensitivity which deter mines the smallest detectable object in mm depends on the size of the reflector and the working distance distance between light barrier and reflector based on the four sec tions of reach Switch position Reach small object sma...

Страница 13: ... 6 8 0 8 4 1 1 26 2 23 3 15 5 5 8 1 Table 4 Sensitivity in mm using switch position small large Switch position Reach large Object small Working distance m Reflector 20 mm 40 mm 80 mm 1 5 20 50 2 4 18 40 3 0 5 15 36 4 12 36 5 5 30 6 0 5 30 8 30 Table 5 Sensitivity in mm using switch position large small eltima electronic 2013 13 ...

Страница 14: ...r the speedlight based on the interruption of the light beam is released later according to the programmed delay One can set the delay on the lowest possible level the light barrier offers that being 20µs from the left side up to a maximum of 10 seconds from the right side A strongly bent characteristic curve allows a very precise setting of up to one second afterwards a rough setting of up to 10 ...

Страница 15: ...assive mode the light bar rier is mounted on a tripod and positioned into the direc tion of the thunderstorm The operating mode switch can be turned with a pen ballpoint pen or with a pair of tweezers that is not too peak Detecting projectiles In order to capture ob jects moving at a speed of more than 200 m s or 720 km h as for example projectiles of guns the light barrier must be switched to the...

Страница 16: ...so reduced significantly To activate the keep active mode switch on the switches 3 and 4 see Image 13 This mode behaves as if the the release button is pressed halfway all the time Therefore the review of pictures is not possible as well as life view modes if existing To review the pictures switch off the keep active mode or disconnect the camera from the light barrier Wake Up Most cameras and spe...

Страница 17: ...o work with the maximum reach After that the light barrier should be mounted and the power supply as well as the camera connection cable be connected Alignment of the light barrier At first point with the beam above the reflector and move the light beam in a meandering pattern into the direc tion of the reflector The distance a of the horizontal routes should be smaller than the diameter d of the ...

Страница 18: ...that the system is prepared and ready to take pictures the camera will be released if the light beam is interrupted Important camera settings Auto focus When photographing with light barriers it is mandatory to switch the auto focus of the camera to manual By not do ing this the camera will probably not release This principle applies for all operating modes of the light barrier Reason The auto foc...

Страница 19: ...ane is parallel to the light beam the subject can be depicted sharply from the left to the right edge of the image no matter where it interrupts the light beam see image 16 Moreover in this context it is irrelevant whether the light beam is positioned horizontally or vertically On the other hand if the focal plane and the light beam in tersect one another in an angle the subject will only be depic...

Страница 20: ...he subject The hit ratio will be highest when the light beam is aligned in such a way that it aims for the broad est side of the subject This will become clear in the following ex ample When looking at birds from the front while they are flying they are way broader than they are high If the light barrier is positioned vertically one can cover an area marked with a blue frame that is almost twice a...

Страница 21: ...r away from the light barrier if possible but nevertheless so that the LED will still go off reliably In case it should not be possible to place the reflector far enough away from the light barrier you can also obtain the favored sensitivity by tilting the reflector to the side as you can see in image 21 until you get the sensitivity you wish to work with Blanking out of smaller objects When takin...

Страница 22: ...r working without a reflec tor the precision of the system is not as high as it is with reflector ei ther The reason for that is simply that one cannot foresee which parts of the object are going to reflect well and which are not Nevertheless this operating mode can be highly attractive especially when working with small focal lengths and thus with larger depths of field or when the objects are sm...

Страница 23: ... simultaneously As switches two transistor in open collec tor circuit are used with a current load capacity of 200 mA each Power supply Picture 24 shows the pinning of the DC plug with 4 75 mm outside and 1 7 mm inside diameter eltima electronic 2013 23 Image 23 pinning of the camera connector release measure GND Minus common pole Image 24 Pinning of the DC plug Minus inner contact Plus outside co...

Страница 24: ...e life with one set of batteries Switch position large distance large objects 4 days other switch positions 7 days tested with average alkaline cells Reach with 80 mm Reflector Switch position small distance small objects 1 3 m small distance large objects 8 m large distance small objects 12 m large distance large objects 16 m Response time Operating mode Normal max 100 µs Bullet Mode max 20 µs Sc...

Страница 25: ...Notes Notes eltima electronic 2013 25 ...

Страница 26: ...eltima electronic Hans Gierlich Staufenstraße 10 73230 Kirchheim unter Teck Tel 07021 863444 Fax 07021 863444 Email mail eltima electronic de URL http www eltima electronic de 26 eltima electronic 2013 ...

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