Joule Meter – PEM 250/500
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.
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