Joule Meter

Joule Meter energy meter

Very compact USB-powered energy meter with high sensitivity

  • Measuring range up to 500 µJ
  • Up to 30 nJ sensitivity
  • Pyroelectric sensor
  • USB-powered
  • Compact design

SETUP

The compact UBS powered µ‑Joule Meter provides measurements of small pulse energies via fiber or free-beam in the range of 25 nJ to 500 µJ by means of the pyroelectric effect. It is characterized by a very low background noise limit of 6 nJ, a measurement dynamics of 16 bit AD-conversion (true 14 bit), a linearity over the measurement range and its high long time stability.

The µ‑Joule Meter features measurement acquisition, processing, settings, software calibration, digitalization and storage. The supplied operating software offers various display modes for the measured and time-stamped values – graphically or by pulse number. Export and statistic functions are provided for the evaluation of the measurements and correction factors can be entered when attenuators are used or transmission losses are to be evened out. Any number of µ‑Joule Meter modules can be operated parallel on a PC.

µ‑Joule Meter software user interface

SPECIFICATIONS

Model PEM 250 PEM 500
Measuring ranges 0.25 / 2.5 / 25 / 250 µJ 0.25 / 2.5 / 25 / 250 / 500 µJ
Repetition rate, max. 500 Hz 500 Hz
Pulse width 3 ps…50 µs 3 ps…50 µs
Detector threshold 30 nJ 30 nJ
Peak power density, max. 10 MW/cm² 10 MW/cm²
Spectral sensitivity 0.19…1.2 µm 0.19…1.2 µm
Linearity < 1 % 1 < 1 % 1
Calibration wavelength 2 355 ± 100 nm 355 ± 100 nm
Accuracy ± 4 % 2 ± 4 % 2
Dynamic range 14 bit 14 bit
Sensor area Ø 8 mm Ø 8 mm
Nominal voltage 5 V DC vom USB-Anschluss 5 V DC vom USB-Anschlus
Dimensions (L x W x H) (91 x 32 x 15) mm (91 x 32 x 15) mm
Connector USB USB
Cable length 1.7 m 1.7 m
Operating temperature +15…+38 °C +15…+38 °C
Storage temperature -10…+60 °C -10…+60 °C
Relative humidity, max. 85 % 85 %

 

1 For the calibration wavelength range
2 Customization

Subject to technical changes without notice

APPLICATIONS

  • Realtime energy measurement via fiber or free beam
  • Online monitoring of pulsed lasers in laser-induced analytics in industrial and medical applications
  • Calibration of systems