def raster(self):
minVolt = -10.0
maxVolt = 10.0
freq = 1
COUNT = 68 * 62
FREQ = freq * COUNT
x = []
y = []
NS = freq * 1
i = 0
while i < 62:
j = 0
while j < 62:
x.append(j)
y.append(i)
j += 1
j = 61
if i is not 61:
while j >= 10:
j -= 10
x.append(j)
y.append(i)
if i is 61: # The scan now has 62+6 points in each line and when it reaches the last line, it uses the same 6 points to go to beginning point
while j >= 10: # For the actual data that we are interested, we have to ignore 6 points after every 62 points
j -= 10
i -= 10
x.append(j)
y.append(i)
i = 61
i += 1
cnt_x = ((((np.array(x) * 0.01 - minVolt) * 65535 /
(maxVolt - minVolt)))).astype(np.uint16)
cnt_y = ((((np.array(y) * 0.01 - minVolt) * 65535 /
(maxVolt - minVolt)))).astype(np.uint16)
daq.DacSetOutputMode(handle, daqh.DddtLocal, 1, daqh.DdomStaticWave)
daq.DacWaveSetTrig(handle, daqh.DddtLocal, 1, daqh.DdtsImmediate, 0)
daq.DacWaveSetClockSource(handle, daqh.DddtLocal, 1, daqh.DdcsAdcClock)
daq.DacWaveSetFreq(handle, daqh.DddtLocal, 1, FREQ)
daq.DacWaveSetMode(handle, daqh.DddtLocal, 1, daqh.DdwmNShot,
NS * COUNT)
daq.DacWaveSetBuffer(handle, daqh.DddtLocal, 1, cnt_x, COUNT,
daqh.DdtmUserBuffer)
daq.DacWaveSetUserWave(handle, daqh.DddtLocal, 1)
daq.DacSetOutputMode(handle, daqh.DddtLocal, 2, daqh.DdomStaticWave)
daq.DacWaveSetTrig(handle, daqh.DddtLocal, 2, daqh.DdtsImmediate, 0)
daq.DacWaveSetClockSource(handle, daqh.DddtLocal, 2, daqh.DdcsAdcClock)
daq.DacWaveSetFreq(handle, daqh.DddtLocal, 2, FREQ)
daq.DacWaveSetMode(handle, daqh.DddtLocal, 2, daqh.DdwmNShot,
NS * COUNT)
daq.DacWaveSetBuffer(handle, daqh.DddtLocal, 2, cnt_y, COUNT,
daqh.DdtmUserBuffer)
daq.DacWaveSetUserWave(handle, daqh.DddtLocal, 2)
self.rasterbuffer = np.ones(NS * COUNT, dtype=np.uint16)
channels = [0]
gains = [daqh.DgainDbd3kX1]
flags = [daqh.DafCtr16]
daq.AdcSetAcq(handle, daqh.DaamNShot, 0, NS * COUNT)
daq.AdcSetScan(handle, channels, gains, flags)
daq.AdcSetFreq(handle, FREQ)
daq.SetOption(
handle, 0, daqh.DcofChannel, daqh.DcotCounterEnhMeasurementMode,
daqh.DcovCounterEnhMode_Counter +
daqh.DcovCounterEnhCounter_ClearOnRead)
daq.AdcTransferSetBuffer(handle, self.rasterbuffer, NS * COUNT, 1,
daqh.DatmUpdateSingle + daqh.DatmCycleOff)
daq.SetTriggerEvent(handle, daqh.DatsExternalTTL, daqh.DetsRisingEdge,
0, daqh.DgainDbd3kX1, daqh.DafCtr16,
daqh.DaqTypeCounterLocal, 0, 0, daqh.DaqStartEvent)
daq.SetTriggerEvent(handle, daqh.DatsScanCount, daqh.DetsRisingEdge, 0,
daqh.DgainDbd3kX1, daqh.DafCtr16,
daqh.DaqTypeCounterLocal, 0, 0, daqh.DaqStopEvent)
daq.AdcTransferStart(handle)
daq.AdcArm(handle)
print "waiting for Scan trigger...\n"
daq.DacWaveArm(handle, daqh.DddtLocal)
tm.sleep(1)
handle1.Ctrig()
print("Scanning...\n")
active, retCount = daq.DacTransferGetStat(handle, daqh.DddtLocal, 1)
while active & daqh.DdafTransferActive:
active, retCount = daq.DacTransferGetStat(handle, daqh.DddtLocal,
1)
#print(active, retCount)
tm.sleep(
0.1
) # Sometimes Data Acquisition isn't finished yet even though the DAC output is complete. Don't know why??? (Update frequencies and # of data points are the same)
daq.AdcDisarm(handle)
daq.DacWaveDisarm(handle, daqh.DddtLocal)
print(self.rasterbuffer, len(self.rasterbuffer))
imagedata = np.zeros((62, 62))
i = j = k = 0
while k < len(self.rasterbuffer):
imagedata[j, i] = self.rasterbuffer[k]
i += 1
if i % 62 is 0:
k += 6
j += 1
i = 0
k += 1
print(imagedata)
plt.clf()
plt.imshow(imagedata, cmap=cm.Greys_r)
plt.show()
# Control Panel Applet. If you have named your device differently than the default,
# it must be changed here for this example to function.
devName = daq.GetDeviceList()[0] #find 1st IOtech device
print "Connected to %s\n\n" % devName
handle = daq.Open(devName)
if handle == -1:
print "Cannot conncet to device\n"
print "Exit"
sys.exit(handle)
print "Setting up scan...\n"
daq.AdcSetAcq(handle, DaamNShot, 0, SCANS)
#Scan settings
daq.AdcSetScan(handle, channels, gains, flags)
#set scan rate
daq.AdcSetFreq(handle, RATE)
#Set buffer location, size and flag settings
daq.AdcTransferSetBuffer(handle, buffer, SCANS, CHANCOUNT,
DatmUpdateSingle + DatmCycleOff)
#Set to trigger immediatly
daq.SetTriggerEvent(handle, STARTSOURCE, DetsRisingEdge, channels[0], gains[0],
flags[0], DaqTypeAnalogLocal, 0, 0, DaqStartEvent)
#Set to stop when the requested number of scans is completed
daq.SetTriggerEvent(handle, STOPSOURCE, DetsRisingEdge, channels[0], gains[0],
flags[0], DaqTypeAnalogLocal, 0, 0, DaqStopEvent)
#begin data acquisition
print "Scanning...\n"
daq.AdcTransferStart(handle)
def setup(self):
# DAC:
# Use channel 0 for z-axis output
# Use PortAB for digital output streaming (provide a sync pulse indicating the start of the scan)
# run DAC output and ADC input (counters) synchronously at a low frequency (traditionally we used a binning frequency of 50000Hz/80 ~ 625Hz
# dz/dV slope of piezo controller
self.dz_dV = 15.0 # um/V (depends on controller and is an approximate value)
self.z0 = 15.0 # um; z-offset (has to be positive to not damage the piezo)
self.delz = 24.0 # um; typical travel of a z-scan
self.T = float(
input(
"Enter the desired time, in seconds, for one complete zscan\n "
)) # s; half period = time to complete an up (or down) ramp
self.N = int(
input("How many scans do you wish to perform in single run?\n"))
self.Thalf = self.T / 2
self.resolution = 1 << 16 # =2**16 (shift bit to left); 16-bit DAC
self.resolution_half = 1 << 15 # =2**15
self.Vrange = 20.0 # V; +-10V output range of DAC
self.dV_DAC = self.Vrange / self.resolution
self.vz = self.delz / self.Thalf # speed of the ramp um/s
# calculate the minimum update rate of DAC to ensure that voltage changes of dV_DAC result in an output update
self.delV = self.delz / self.dz_dV # voltage amplitude of ramp
self.V0 = form.voltage # voltage offset
self.freq_min = self.delV / self.dV_DAC / self.Thalf # minimum update frequency
self.FREQ = max(1000,
self.freq_min) # set a lower floor for freq of 1kHz
# make sure the freq is compatible (commensurable) with the number of data point per scan
self.nwavehalf = int(
round(self.FREQ *
self.Thalf)) # number of data points in half of waveform
self.nwave = self.nwavehalf * 2
self.FREQ = self.nwavehalf / self.Thalf
# generate scan waveform
self.Vtup = (np.ones(self.nwavehalf).cumsum() - 1) / (
self.nwavehalf - 1) * self.delV # up-ramp voltage waveform
self.Vtdown = np.fliplr([self.Vtup])[0] # down-ramp voltage waveform
self.l = len(
self.Vtup
) / 2 # facilitates to make a ramp that starts from middle rather than bottom or top
self.Vtmid = self.Vtup[self.l]
self.Vtadjust = self.V0 - self.Vtmid # facilitates the mid-ramp to start at the focus point set by piezo
self.Vt = np.concatenate([
self.Vtup[self.l:] + self.Vtadjust, self.Vtdown + self.Vtadjust,
self.Vtup[:self.l] + self.Vtadjust
])
self.Vt = np.tile(self.Vt, self.N)
# convert Vt into DAC count waveform (-10V = 0, 0V = 32768, +9.99969482421875V = 65535)
# ((65535 - 32768 - 65535) + count) * dV_DAC = (count - 32768)*dV_DAC
self.DACwave = np.around(self.Vt / self.dV_DAC +
self.resolution_half).astype('uint16')
# prepare waveform for digital output; used to mark the start of the scan
# Note: make sure that the output port is initialized to LOW before start of waveform
self.COUNT = self.N * self.nwave # = SCANS
self.bufSYNC = np.zeros(self.COUNT, dtype=np.uint16)
self.bufSYNC[
0] = 1 # |^|________ single pulse at start of digital waveform
# to read SYNC connect A0 to CNT1
# prepare ADC readSCAN
self.SCANS = self.N * self.nwave # = COUNT
self.CHANCOUNT = 2
self.channels = [0, 1] # 16 bit counter, 16 bit counter
self.gains = [daqh.DgainDbd3kX1, daqh.DgainDbd3kX1] # ignored
self.flags = [daqh.DafCtr16, daqh.DafCtr16]
# get read buffer for photoncounts and sync pulses
self.readbuffer = np.ones((self.SCANS * self.CHANCOUNT, ),
dtype=np.uint16)
# set start and stop conditions of readSCAN
self.STARTSOURCE = daqh.DatsExternalTTL
self.STOPSOURCE = daqh.DatsScanCount
print "Setting up ADC scan...\n"
daq.AdcSetAcq(handle, daqh.DaamNShot, 0, self.SCANS)
# Scan settings
daq.AdcSetScan(handle, self.channels, self.gains, self.flags)
# set scan rate
daq.AdcSetFreq(handle, self.FREQ)
# Setup Channel 0 (photon counts) for count mode 16 bit, clear on read
daq.SetOption(
handle, self.channels[0], daqh.DcofChannel,
daqh.DcotCounterEnhMeasurementMode,
daqh.DcovCounterEnhMode_Counter +
daqh.DcovCounterEnhCounter_ClearOnRead)
# Setup Channel 1 (SYNC pulse read) for count mode 16 bit, clear on read
daq.SetOption(
handle, self.channels[1], daqh.DcofChannel,
daqh.DcotCounterEnhMeasurementMode,
daqh.DcovCounterEnhMode_Counter +
daqh.DcovCounterEnhCounter_ClearOnRead)
# Set buffer location, size and flag settings
daq.AdcTransferSetBuffer(handle, self.readbuffer, self.SCANS,
self.CHANCOUNT,
daqh.DatmUpdateSingle + daqh.DatmCycleOff)
# Set to Trigger on hardware trigger
daq.SetTriggerEvent(handle, self.STARTSOURCE, daqh.DetsRisingEdge,
self.channels[0], self.gains[0], self.flags[0],
daqh.DaqTypeCounterLocal, 0, 0, daqh.DaqStartEvent)
# Set to Stop when the requested number of scans is completed
daq.SetTriggerEvent(handle, self.STOPSOURCE, daqh.DetsRisingEdge,
self.channels[0], self.gains[0], self.flags[0],
daqh.DaqTypeCounterLocal, 0, 0, daqh.DaqStopEvent)
print("Setup complete.\n")
