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Home Physics Pyroelectric USB All-in-One Detector and Energy Meter: VEP-9P-Ta

Pyroelectric USB All-in-One Detector and Energy Meter: VEP-9P-Ta



Pulse Radiation Energy Meter VEP-9P-Ta is compatible with PC-AT and newer-type computer and is connected to it via USB port, requiring no separate analyzing block. When a radiation pulse falls on the pyroelectric sensing element, it generates an electric current pulse with magnitude proportional to the energy of the radiation pulse. Built-in matching amplifier, microcontroller, and central processor, together give real-time output of calculated results to PC via USB connection interface for further processing and visualization.

For each pulse, upon completion of the needed calculations, microcontroller transfers to the PC a package containing information on pulse energy value, time span between pulses, pulse sequence number and device status word (information).

The PC-compatible software with this information package, records calibration data and functioning parameters, controls device's working regimes, calculates radiation pulse average power & repetition rate and visualizes measurement state and results (energy, average power, and measured pulses repetition rate).


All-in-One USB Radiation Energy Meter VEP-9P-Ta permits high accuracy on-the-job and real-time measurements by allowing the on-line monitoring and the consequent tuning of the laser-beam "on-the-fly": the beam pulses pass-through the pyrometer's sensitive element without beam cut-off and significant beam obtrusion.

All-in-One USB Radiation Energy Meter VEP-9P-Ta can be used without a special coating for a wide spectrum of wavelengths with losses about 20%-25% of beam's energy, and with losses less than 0.5% for use with a specific wavelength employing narrowband AR coating on the sensing element. In this last case, the energy/power of a pulsed or Q-switched laser can be real-time monitored without work interruption since there is no significant quantitative or qualitative change in the laser beam.

In case measurement of higher levels of energy is required, USB Radiation Energy Meter VEP-1 can be used, maintaining all the functions of the VEP-9P-Ta, only obstructing the measured radiation.


  • Wavelength range, μm ––––––––––––––––––––––––––––––––––––– 0.35 ÷ 5.0
  • Energy range, μJ ––––––––––––––––––––––––––––––––––––––––– 10 ÷ 3200
  • Energy resolution, μJ –––––––––––––––––––––––––––––––––––––– 0.1
  • Maximum energy density
    (pulse duration t > 45ns), J/cm2 ––––––––––––––––––––––––––––– 5
  • Max repetition rate, pps ––––––––––––––––––––––––––––––––––– 2000
  • Max pulse duration, μs –––––––––––––––––––––––––––––––––––– 10
  • Detector –––––––––––––––––––––––––––––––––––––––––––––––– Pyroelectric
  • Diameter of sensitive element, mm –––––––––––––––––––––––––– 10
  • Sensing element material –––––––––––––––––––––––––––––––––– LiTaO3
  • PC connection interface type ––––––––––––––––––––––––––––––– USB 2.0
  • Power consumption, W –––––––––––––––––––––––––––––––––––– 0.5 (Via USB interface)
  • Operation environment Temperature, °C ––––––––––––––––––––––– +5 to +40
  • Operation envirinment relative humidity
    (not more than), % –––––––––––––––––––––––––––––––––––––––– 95
  • Overall dimensions, diameter, height), mm –––––––––––––––––––– 100 x 60
  • Weight (not more than), kg ––––––––––––––––––––––––––––––––– 0.5

Innovative Aspect and Main Advantages


This particularly innovative "all-in-one" compact model, incorporates all three already known functions of a the new sensor-meters incorporating a USB-interface plus a fourth and novel function feature, that of being able to perform uninterrupted 'on the-job' energy measurements:

The VEP-9P-Ta allows for narrow-band pulsed coherent / non-coherent radiation to pass through its aperture practically unobtrusively and enables the VEP-9P-Ta sensor / meter to monitor on-the-job the energy / power status of a radiation source and equipment during its on-going operation, if and whenever requested.

In addition, the particular sensor-meter is using a ragged high performance Lithium Tantalate sensor element that allows to measure on-line energy ranges equal or higher to 5.000 mJoules during the above on-going operations.


  • Measuring Energy of high-power lasers with power density more than 5 J/cm2;
  • Direct real-time monitoring of output radiation allows to perform a feedback stability control of this radiation on demanding applications (e.g. hard tissue operations welding of plastics and cutting/metals);
  • Ideal for labs with limited budget for buying both detector and meter;
  • Perfect for labs with inadequate space for peripheral equipment installation as we can measure energy without the need to install beam splitters and deviators thus producing considerable space economies and experimentation simplifications;
  • Unique for labs requiring instrumentation with very high sensitivity coupled with increased power and improved operating speeds;
  • No need for Power supply and cooling;
  • Stable and reliable, can stand more heat, mechanical and radiation impacts in difficult operational conditions than it is usual with other Pyroelectric meters based on Lithium Tantalate crystals.

Pyroelectric USB All-in-One Detector and Energy Meter: VEP-9P-Ta
Fig. 1 Pyroelectric USB All-in-One Detector and Energy Meter: VEP-9P-Ta

Areas of Application

This new Pulse AII-in-One USB Radiation Energy Meter VEP-9P-Ta is basically designed to measure the energy characteristics of strong pulsed coherent and non-coherent radiation emitted at a wider range of wavelengths (0,35 to 5.0 μm).

Contact Details

Technology Transfer Office
Organization: Institute of Physics
Adress: 46, Nauky Avenue, 03680, Kyiv, Ukraine
(+38 044) 525 9841, Fax: (+38 044)525 1589
This e-mail address is being protected from spambots. You need JavaScript enabled to view it


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