ND&M ACCUMULATING FRAMEGRABBER Operating Instructions Manual Download Page 1 | Manualshive

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ND

&

M

Neutron Detectors and more ...

ACCUMULATING FRAMEGRABBER

for the

NEUTRON-HANDMONITOR

Operating Instructions

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Summary of Contents for ACCUMULATING FRAMEGRABBER

Page 1: ...ND M Neutron Detectors and more ACCUMULATING FRAMEGRABBER for the NEUTRON HANDMONITOR Operating Instructions ...

Page 2: ... is equipped with For special applications e g the detection of low energy X rays with customer specific versions of the Handmonitor where a single quanta does not give enough light to be well separated from the noise floor of the image intensifier and CCD camera this mode is the mode of choice 2 Summing up of frames with discriminator set to a level well above noise Setting the discriminator to a...

Page 3: ... before operating the Accumulating Framegrabber the Readout Unit and the Handmonitor WARRANTY CONDITIONS The warranty period is 6 months after delivery date Credit prorata replacement upon failure within 6 months Please refer also to the warranty conditions for the Handmonitor ...

Page 4: ...Do not change this setting unless you encounter a bus conflict with some other board in your PC We chose this address because it showed a very low probability of interfering with other cards The Accumulating Framegrabber uses only 8 consecutive addresses in the I O space of your PC and NO interrupts or DMA channels Please check also that you really insert the 200 240 280 2c0 300 340 380 3c0 defaul...

Page 5: ... haven t done so already Hot plugging of the Readout Unit should usually be no problem unless you have an exceptionally weak power supply in your PC Turn on the power switch on the Readout Unit The power indicator LED on the Readout Unit should be on now Try out the software on the supplied disks To adjust the focus of the CCD camera carefully turn the focus ring on the lens For this open the came...

Page 6: ...r resolution and higher sensitivity Overlapping frames are no subject for the Accumulating Framegrabber because here the frames are summed up anyway The shutter switch should be set to the off position unless you have a special application that makes use of the shutter of course Don t care for the shutter speed select switch it is ignored when the shutter is switched off Internal Controls Changing...

Page 7: ...7 rear side lens side CCD video board CCD Gain adjustment RV301 Fig 3 Gain adjustment potentiometer inside the CCD camera of the Readout Unit ...

Page 8: ...he Accumulating Framegrabber see fig 4 Keep in mind that you should optimize for 1 Best signal to noise ratio 2 Highest dynamic range 3 Lowest nonlinearities 4 Highest spatial resolution I If you are primarily using the Accumulating Framegrabber without discrimination and without further determining the locations of the scintillation events consider the following That means that you should use a h...

Page 9: ...nsider the following Using the technique of discrimination and further processing of the data needs scintillation signals that are well above noise in each frame The standard neutron scintillator NE426 fulfills this requirement Use the standard gain setting of the CCD as it was set when it was delivered open the aperture of the lens set it to f 1 3 or f 1 4 depending on lens type turn the ADC adju...

Page 10: ...rames per integration period 2 FRAMEXP 1 define FRAMEXP 0 define FGRW 0x240 define FGINT 0x242 define FGRES 0x244 define FGTHR 0x246 define VBASE 0xd0000000L int mx my main int i GrSetMode GR_width_height_color_graphics 1024 768 256 Set graphics mode for i 0 i 255 i GrSetColor i i i i Set palette while kbhit Read in AFG until key pressed inportw FGRW inportw FGRW outportw FGRW 0 outportw FGRW 0 Ma...

Page 11: ...or j 0 j 160 j outportw FGRW 0 inportw FGRW inportw FGRW inportw FGRES Make sure that the Fifo captures also the last data words for j 0 j 256 j Read in the even lines inportsw FGRW iline 512 for i 0 i 512 i p unsigned char iline i FRAMEXP 1 p 1536 p char VBASE 1024 for j 0 j 256 j Read in the odd lines inportsw FGRW iline 512 for i 0 i 512 i p unsigned char iline i FRAMEXP 1 p 1536 That s it void...

Page 12: ...a word and starts an integration period The integration time can thus have 8 different values 0 2 x 40 ms 80 ms 1 4 x 40 ms 160 ms 2 8 x 40 ms 320 ms 3 16 x 40 ms 640 ms 4 32 x 40 ms 1280 ms 5 64 x 40 ms 2560 ms 6 128 x 40 ms 5120 ms 7 256 x 40 ms 10240 ms A read on this address retrieves the status of the Accumulating Framegrabber in bit 0 of the data word Right after writing to FGINT this bit 0 ...

Page 13: ...S ADC resolution 8 bits of digitized pixels 512 x 512 Pixel clock 14 318 MHz Frame Buffer 512 kByte Discriminator 8 bits programmable Signal system CCIR system Horizontal scan frequency 15625 Hz Vertical scan frequency 50 Hz Video input 1 0 V p p 75 Ohms unbalanced Sync output 1 V p p negative Board type 16 bit ISA operating conditions 20 40 C 0 40 rel humidity Ser No _____________________________...

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