常见问题答疑

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Meters Properties

  • How does an energy meter measure above the maximum frequency at which it can record every pulse?
  • What is the resolution and update rate of the Ophir Power and Energy Meters analog output?
  • Can the Laserstar work in dual channel mode with pyro and thermal sensors together?
  • My Nova-II or Vega doesn't turn on.
  • Can I upgrade my Nova-II or Vega software by myself or do I have to send it in to an Ophir distributor?
  • I can understand why a power meter sensor needs to be recalibrated, but why do I have to have my Power and Energy Meters recalibrated?
  • When a damage threshold spec refers to a certain maximum power density (or energy density), what beam profile is assumed?
  • Do I have to turn my meter off and on again when I connect a different sensor head?
  • What is the Ophir meter zeroing and when should it be performed?
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General Information about Sensors and Meters

  • When an accuracy spec is given, what exactly is meant?
  • What are the ambient conditions specifications of Ophir Sensors and Power and Energy Meters?
  • Is the +/- 3% accuracy with respect to full scale?
  • How do you calculate the power and energy density of a laser beam?
  • If I have a sensor calibrated for a particular wavelength and a curve of the relative sensitivity at different wavelengths, how do I correct for a reading at a different wavelength?
  • What is the definition of "minimum power" as it appears in the sensor data sheets?
  • What is spec on uniformity over the surface?
  • What is the standard recalibration interval for Ophir Power and Energy measurement sensors?
  • When using the fiber optic adaptor, how do we handle power loss due to the fiber relative to calibration?
  • Why do people need or want to buy Power and Energy meter equipment. Why do they need/want to measure their laser beams? Why wouldn't they just assume the lasers are working the way the manufacturer said?
  • In what apps is a precise measurement generally needed?
  • What do people do when they find their laser is degrading?
  • Are laser users aware that they need to do Power and Energy measurement even if their device has an internal power/energy indicator?
  • Do aesthetic lasers need external power/energy monitoring?
  • What is the minimum power you can measure?
  • What is the shortest pulse that can be measured?
  • I am integrating a L100(500A) power meter head into a workstation and I would like to know how long between "readings" do I have to wait for the head to cool or what dictates how long I can shoot into the head. I realize that I can put a beam into the head at 500W for 1 min, 300W for 2 min or 75W continuously...but what determines how long I must wait if I wanted to take a 150W reading for 20 seconds, 10 times in a row (as an example)? How long would I have to wait between shots or could I take 5 readings, then wait 1 min and take 5 more etc.
  • When a damage threshold specification refers to a certain maximum power density (or energy density), what beam profile is assumed?
  • Can Broadband coatings on the PE sensors and 3A sensors be cleaned with a cotton swab or optical tissue wipe?
  • Our thermal sensor specification states "Power Accuracy +/- 3% at calibration wavelength". To what exactly does the 3% refer?
  • Is the Nova II meter absolutely necessary for generating an analog output? Can I take an analog output directly from the sensor?
  • How long do I fire the laser into the sensor? Do I need to fire the laser more than once? How do I process the information in the PLC to output the correct power measurement to the operator?
  • What are the top 3 or 4 key specifications to understand when selecting a sensor and meter? Can you list some of the trade-offs between specifications?
  • • How can we be sure of the calibration of our high power sensors when we calibrate at a small fraction of full power?
  • How does one know the minimum power that a laser power meter can measure?
  • What should I look for when checking laser power or energy meters for damage threshold?
  • How much power can I put into an Ophir sensor if I only use it for a short time?
  • We have an FL500-A head, which we use with a QUASAR bluetooth interface. Of course we calibrated the FL500, but since the QUASAR is a digital link it didn't make sense that it should also be calibrated, but I want to verify this.
  • I've lost my AC Charger. What are the output requirements?
  • I just received my new Ophir Power/Energy equipment. What are some tips I can use to keep this equipment in top performance?
  • How do I select the correct wavelength with sensors that have a continual response curve such as silicon photodiode sensors, -LP1 thermal sensors and 3A-IS sensors?
  • Must I use a particular sensor only with the meter it was ordered with?
  • Why doesn't my Ophir meter turn on
  • What meters support the BeamTrack (PPS) sensors?
  • When replacing a power meter battery should it be recalibrated?
  • Can I use a non Ophir power supply with my Ophir equipment?
  • How should I clean my sensor?
  • How is the power meter sensor calibrated for wavelengths other than the specific wavelengths used for calibration?
  • Integrating spheres are used when you have divergent light sources. How do they work?
  • Can I use a third party sensor with the Ophir power/energy meters
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PC Interface Questions

  • I see that you have several LabVIEW packages. What is the difference between them?
  • Using your labVIEW VIs, I have followed all of the instructions and receive the error "1301" etc.
  • Using the OphInstr LabVIEW library, what should I do if the Ophir VI does not communicate with the device?
  • How can I test if the IEEE adapter of Laserstar is functioning properly?
  • What should I do if I have IEEE Communication Problems?
  • Can the Laserstar be used with both the analog and RS232 at once?
  • How can I interface my Ophir Power Meter (Juno, USBI, Pulsar, NOVA II, Vega) to LabVIEW?
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Photodiode Sensor Properties

  • Are there any special problems with the calibration stability of integrating sphere sensors?
  • How does the BC20 measure the true power of a scanned beam?
  • Are there etalon effects with the PD300 between the different filters causing instability of readings?
  • Can the PD300 be used with the filter in and with fiber adapter at the same time?
  • What is the accuracy of the PD300 sensor at 350-360nm?
  • How can one replace and recalibrate the PD300 removable filter without sending the sensor back?
  • The total error when using a PD-300 head is listed as +/- 3%. Is that 3% of the reading or 3% of the total range?
  • Can I use a sensor from the PD300 family to measure average power of pulsed lasers?
  • What does the PD300 "Background Subtraction" do?
  • How do I take off the removable filter from the PD300?
  • When I hook my PD300 photodiode sensor to a Vega I see 5 drop-down wavelengths? Is that all I can use, or is there a way to select the wavelength I need to use it at?
  • When measuring a fiber output, should I put the fiber tip right up against the PD300 detector? If not, how close should I come?
  • I am using a PD300 type sensor. I have a broadband light source, but only want to measure the power of a specific wavelength. Can I set my meter to that wavelength and get a measurement?

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Pyroelectric Sensor Properties

  • What is the new "User Threshold" feature on the new Pyro-C series and how does it work?
  • How do I get the most accuracy out of my pyroelectric sensor? – zeroing
  • Are pyro sensors suitable for power measurement and if so, what is the accuracy?
  • Can pyro sensors be used for single pulse measurements?
  • Can the pyro scope adapter be used with an Ophir pyro sensor without a Power and Energy Meters?
  • What is the temperature dependence of pyroelectric sensors?
  • Is there a minimum rise time or pulse width for energy sensors?
  • Can our sensors work in a vacuum?
  • What happens if you measure pulses longer than maximum pulse width setting you are on?
  • How does the pyroelectric sensor behave for pulsed radiation at a frequency which is over the data sampling rate?
  • What is the diffuser transmission for the PE50BB-DIF at various wavelengths?
  • What is the absorption of the pyroelectric broadband coating in the region 20-40um?
  • Can the PE10 sensor be used at 10.6um and how accurate is it?
  • Can the PE50BB-DIF be used with an erbium laser at 2.94um?
  • What is the variation in sensitivity from sensor to sensor in V/J for the PE-S type sensors?
  • What should I do if my pyro sensor triggers on a sensitive range even without a laser pulse?
  • I seem to be getting incorrect/ illogical readings with my pyroelectric sensor at low energy levels.
  • What should I do to prevent damage to the pyroelectric sensor?
  • Can I use a PE-C pyroelectric sensor for higher powers for a short time without the optional heat sink?
  • Why is a special adapter needed for the newer PE-C type sensors to work with the Nova meter?

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USB Interface, Juno


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Thermal sensor Properties

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Quasar
  • If you have designed your own data collection software to take data from the USB on the Nova II, can you do the same with the Quasar?
  • Does the Quasar require annual recalibration?
  • Can one device transmit data to more than one Bluetooth receiver? What if you are reading the data on a laptop in the clean room (one area) while simultaneously recording the data in an adjacent office?
  • How far can the Quasar really transmit data and can it go through walls?
  • At what frequency does the Quasar work? Might there be concerns with interference from other devices?
  • Will my Quasar work with my Android device?
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