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SS-OCT System Base Unit

 

Chapter 6: Troubleshooting

 

Rev A, December 17, 2018 

Page 45 

Chapter 6 

Troubleshooting 

Symptom 

Possible Cause 

Solution 

System Does Not Start 

No power is supplied to the unit 

Connect the power supply

Power cord is broken 

Change power cord 

Other reason 

Call Thorlabs

1

 

System Does Not Make 
Measurements 

PC crashed 

Restart PC 

Poor connection of USB cable 

Check USB connection 

Data acquisition cables not inserted 

Connect data acquisition 

cables 

Optical path length not matched 

Adjust optical path length

Beam is blocked 

clean fiber tip 

Other reason 

Call Thorlabs

1

 

No Signal in Image 

Fiber not connected 

Connect fiber patch cable

Fiber tip is dirty 

Clean fiber tip  

Scanner not connected 

Connect Scanner 

Focus is out of imaging area 

Adjust reference length, 

readjust focus 

Other reason 

Call Thorlabs

1

 

Bad Image Quality 

Mirrored image shown 

Observe the OCT image 

while adjusting the 

distance of the scanner to 

the sample 

Distance to the sample is too short 

When decreasing the 

distance, the image 

needs to move towards 

the top of the OCT image

Other reason 

Call Thorlabs

1

 

Flipped Image 

Reference length set incorrectly 

Adjust reference length 

Table 3   Troubleshooting 

                                                      

1

 Please refer to Chapter 12 for Thorlabs contact information. 

Содержание VEG200 Series

Страница 1: ...Swept Source OCT System Base Units VEG200 Series User Manual...

Страница 2: ...Original User Manual not translated...

Страница 3: ...18 3 2 SS OCT Base Unit Components 20 Base Unit 20 PC with Graphical User Interface 20 SDK 20 Imaging Scanner Accessory 22 OCT Stand Accessory 23 Chapter 4 System Operation 25 4 1 Starting the System...

Страница 4: ...pter 7 Certifications and Compliance 47 7 1 Declaration of Conformity Vega Series Base Units 47 Chapter 8 Warranty 49 8 1 Lasers and Imaging Systems 49 8 2 Non Warranty Repairs 49 8 3 Warranty Exclusi...

Страница 5: ...ck the supply voltage of the system before plugging in the computer Make sure the included power cords for the base unit computer and monitor are connected to a properly grounded outlet 100 240 VAC 50...

Страница 6: ...be used within the range of three meters of this unit since the electromagnetic field intensity may exceed the maximum allowed disturbance values according to IEC 61000 6 1 2005 The safety of any syst...

Страница 7: ...temperature Handle all connectors both electrical and optical with care Do not use unnecessary force as this may damage the connectors Handle the optical fiber with care Mechanical stress can decreas...

Страница 8: ...ore plugging it into a receptacle 3 Always cover the fiber end that is not in use with a fiber cap or dust protection cover The cleaning procedure sucess could be visualized using a fiber inspection s...

Страница 9: ...cap Push the case to start the cleaning process a click indicates that the cleaning is complete 1 2 3 Service Only trained and approved Thorlabs personnel are allowed to service the system Please con...

Страница 10: ...ector for OCT SIGNAL to connect to Alazar Tech ATS9351 or ATS9360 C SMA Connector for DAQ k CLOCK to connect to Alazar Tech ATS9351 or ATS9360 D USB Data Port to Connect PC USB 2 0 Type B Interface E...

Страница 11: ...ted Thorlabs imaging scanner OCTH and furthermore allows the use of a custom scanner It hosts two analogue signals for driving separate actuators e g Galvanometer scanner communication lines and suppl...

Страница 12: ...ate Operate this system on a flat dry and stable surface only 1 Install the PC monitor mouse and keyboard according to the documentation provided by the PC manufacturer 2 If applicable assemble the OC...

Страница 13: ...to the imaging scanner Align the red dot of the plug to the alignment mark of the electric connection port of the scanner e g OCTG Figure 7 Plugging the Electrical Connector into the Scanner Push the...

Страница 14: ...se with the system packaging Figure 9 Fiber Connection to the Imaging Scanner A Slide the fiber tip into the center bore of the fiber connection B and C The fiber needs to be rotationally oriented so...

Страница 15: ...en installing the fiber make sure that the fiber tip does not get contaminated by dust Do not touch the fiber tip Remove the dust caps from the fiber end and from the FC APC fiber connection at the ba...

Страница 16: ...ctor are bolted tightly Connect the USB cable to the USB port and make sure the connection is tight Figure 12 Installation of the Electrical Connections at the Base Unit 10 Connections at the PC see F...

Страница 17: ...lazar top and NI DAQ bottoms Cards 15 Removing the protective cap off the scan objective Pull the protective cap off the scan objective Do not rotate the protective cap as this might loosen the fit of...

Страница 18: ...iber coupler into the sample and reference arms of an interferometer setup Back reflected light attributed to variations in the index of refraction within a sample recouples into the sample arm fiber...

Страница 19: ...uisition 1 4 In Full Range OCT setups the image depth could be doubled The signal width has two limits One limit for the signal width is given by the spectral distribution of the light source For a fu...

Страница 20: ...depth measurement range in OCT experiments as its distinctive advantage compared to conventional short external cavity on the level of a few millimeters based swept sources The MEMS VCSEL SS OCT syst...

Страница 21: ...ic Diagram of the VEG200 Series Swept Source OCT System OCT Stand Base Unit VEG200 Imaging Probe PC System Monitor Swept Source OCT Imaging System VEG200 Probe Galvo Scanner Keyboard Mouse Display Por...

Страница 22: ...shows a tomato s A scan data The ordinate of this graph represents the modulation amplitude based on the number of measured electrons per camera pixel Other scales do not change the measurement The im...

Страница 23: ...gh the volume or by 3D rendering Please refer to the SD OCT Software Manual for all features available Figure 19 Rendered Volumetric Data Set Figure 20 En Face View or C Scan When displaying a plane w...

Страница 24: ...ring losses with the need to operate within the wavelength range that will provide higher penetration depth into the sample Near IR broadband sources are a perfect compromise between sufficient transp...

Страница 25: ...convert a spectrum measurement into an A Scan set the color scheme brightness and contrast of images calculate the speed of particles in the sample via Doppler OCT import and export the different fil...

Страница 26: ...ce path is set up inside the base unit Thus the imaging scanners presented below are no reference NR versions Various lens kits are available for these scanners Please note that the reference offers a...

Страница 27: ...ber 17 2018 Page 23 Figure 24 OCTH NR Handheld Scanner 3 2 5 OCT Stand Accessory The Thorlabs OCTG and OCTP scanners can be adapted to an OCT STAND For this OCT STAND the rotation and translation stag...

Страница 28: ...ase Unit Chapter 3 Description Page 24 MTN013142 D02 Figure 26 OCT STAND Adjuster Figure 27 OCT XYR1 Sample Rotation Stage For further details on the OCT STAND and the OCT XYR1 please refer to the Tho...

Страница 29: ...required for proper operation of the base unit 1 Turn on the base unit by placing the main switch to the Position Verify that the power button indicator at the front panel turns red as shown in Figur...

Страница 30: ...nce the ThorImageOCT software was started Verify that the green Laser ON LED is turned on as shown in Figure 30 In case something is wrong with the laser source or the system is not connected correctl...

Страница 31: ...o that the zero delay line is set to a depth position of 0 mm This means that when the surface of the sample under test is placed in the focus of the objective in use it will be shown at 0 mm of the i...

Страница 32: ...25 of the OCT Stand Then the final position of the OCT image in the B scan or volume scan can be set using the reference stage control again Vary the value to move the image up and down until you achi...

Страница 33: ...36 Polarization Adjustment in the Reference Path In order to adjust polarization in the reference path there are two motorized controllers available one acting as a QWP and the other as a HWP By movin...

Страница 34: ...o correlated signals in the sample path the reference light can be blocked completely Moreover the amplification level for the OCT signal can be modified as well Depending on the characteristics of th...

Страница 35: ...ns For samples with a small axial focus length an objective lens with a high numerical aperture can be chosen This will grant a small lateral and axial focus hence allowing a more in depth analysis of...

Страница 36: ...the B scan Figure 40 A After finding the focus autocorrelation terms will appear in the upper part of the image even without any reflecting surface in the field of view of the B scan When these artifa...

Страница 37: ...Figure 41 Plastic with Matte Surface Partially Covered with Clear Adhesive Tape Figure 41 shows a B scan of a plastic substrate with a matte surface The right part of the surface was covered with a st...

Страница 38: ...cience This technology is ideal for in line industrial imaging applications ranging from laminated packaging films to 3D visualization of mechanical parts Skin Imaging SS OCT provides real time high r...

Страница 39: ...OCT can also be used for non biological material science applications SS OCT is ideal for monitoring surface topography and layered structures Figure 44 B Scan of a Semi Transparent Molded Plastic Ca...

Страница 40: ...ially rectangular Consequently additional harmonic frequencies of the root signal appear Figure 47 High Surface Reflection Causing Saturation and Nonlinear Response of the Spectrometer A typical examp...

Страница 41: ...shown deeper in the image than physically present Figure 49 Schematic of a Setup to Show the Influence of Multiple Scattering Multiple scattering is intense in paper For illustration of this artifact...

Страница 42: ...25 kHz at 930nm the maximum detectable speed v in the direction of the A scan axis is 290 m s When the direction of the movement occurs at an angle with respect to the A scan axis larger speeds can be...

Страница 43: ...ter or longer from the beam splitter to the sample compared to the reference arm length When adjusting the reference length to be too long the image appears flipped Figure 52 Right Orientation Up Refe...

Страница 44: ...h information one can only see information from regions in the sample where photons are transmitted to and allowed back into the sampling aperture Reflections strong scattering and absorption lead to...

Страница 45: ...erometer The optical paths within these arms are defined by the mechanical path lengths and the refractive indices of the materials When talking about the refractive index of an optical material most...

Страница 46: ...The spectral resolution of a frequency domain OCT system defines its possible measurement depth This depth is the maximum detectable optical path length difference limited by the Nyquist criteria In r...

Страница 47: ...s of imaging depth depends on the amount of material through which the beam passes As a result the measured depth in the sample changes throughout the scan In the setup shown in Figure 58 one can dete...

Страница 48: ...ptical path and the displayed OCT image makes it difficult to perform an inverse ray tracing because all the diffractive interfaces need to be determined in 3D Even this determination needs to be unde...

Страница 49: ...Beam is blocked clean fiber tip Other reason Call Thorlabs1 No Signal in Image Fiber not connected Connect fiber patch cable Fiber tip is dirty Clean fiber tip Scanner not connected Connect Scanner Fo...

Страница 50: ...he existing fuse and install the appropriate replacement fuse for the respective unit 1 Use only IS 1A 250VAC Type T 5x20mm style fuses IEC 60127 2 III low breaking capacity slow blow for the Base Uni...

Страница 51: ...SS OCT System Base Unit Chapter 7 Certifications and Compliance Rev A December 17 2018 Page 47 Chapter 7 Certifications and Compliance 7 1 Declaration of Conformity Vega Series Base Units...

Страница 52: ...SS OCT System Base Unit Chapter 7 Certifications and Compliance Page 48 MTN013142 D02...

Страница 53: ...is performed 8 3 Warranty Exclusions The stated warranty does not apply to products which are a specials modifications or customized items including custom patch cables meeting the specifications you...

Страница 54: ...0 mm Airborne Noise Emission 70 dBA Base unit has universal AC input Table 4 General Specifications Optical Performance Specifications Vega Series Base Unit Base Unit VEG210 VEG220 Central Wavelength...

Страница 55: ...SS OCT System Base Unit Chapter 10 Mechanical Drawings Rev A December 17 2018 Page 51 Chapter 10 Mechanical Drawings Figure 61 Base Unit Dimensions...

Страница 56: ...horlabs products such as Pure OEM products that means assemblies to be built into a unit by the user e g OEM laser driver cards Components Mechanics and optics Left over parts of units disassembled by...

Страница 57: ...tion USA Canada and South America Thorlabs Inc sales thorlabs com techsupport thorlabs com Europe Thorlabs GmbH europe thorlabs com France Thorlabs SAS sales fr thorlabs com Japan Thorlabs Japan Inc s...

Страница 58: ...M0009 510 535 A www thorlabs com...

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