Coherent FieldMaxII-TOP Especificações descarregar pdf (Página 21)

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Models PM10-19C, PM150-50C and PM150-50XC

Laser

Cross-

Reference

Index

POWER

& ENERGY

Power

Sensors

Energy

Sensors

Custom

& OEM

BEAM

DIAGNOSTICS

CALIBRATION

& SERVICE

INDICES

Product

Name

Index

Power

& Energy

Meters

Long-Pulse Energy Measurement with a Thermopile

Power Sensors Introduction

Thermopile sensors are most commonly used for average power

measurements on pulsed and CW lasers. Thermopiles are also capable of

integrating long pulse widths. This allows the thermopile to measure the

energy of single pulses between 1 millisecond and 10 seconds in length,

and with energies from millijoules to hundreds of Joules. Long-pulse

measurement is only possible when the thermopiles are used in

conjunction with LabMax-TOP, LabMax-TO, or FieldMaxII-TOP meters.

This ability to integrate relatively long laser pulses with a thermopile is

necessary when the laser pulse width exceeds the maximum pulse width

rating of pyroelectric sensors. Pyroelectric sensors are typically limited to

maximum pulse widths in the millisecond range. When the pulse width

exceeds milliseconds, a thermopile is a good solution.

A good “rule of thumb” for using a thermopile for this type of measurement

is to compare the maximum pulse energy you need to measure with the

maximum power rating of a sensor (maximum power ratings can be found

in the Power Sensor Summary Specications on pages 20 to 21 or in the

detailed product specications contained on pages 22 to 37).

Common applications for this type of measurement are in the medical

eld, especially skin resurfacing and hair removal, and in material

processing applications such as laser welding. These laser systems often

utilize high-energy diode lasers that have large beam sizes and relatively

long pulses. A detector like the PM150-50C is ideal for these measurements.

It features a large 50 mm aperture size, can handle pulse energies up to

150J, and can be used air-cooled for single pulse energy measurements

(a PM150-50C will normally need to be water-cooled for continuous power

measurements).

Using a LabMax power/energy meter expands the range of long-pulse

Joule measurements down into the low millijoule level when used with

thermopiles such as the PS10, PS10Q, PS19, and PS19Q sensors.

Long-pulse measurements are limited to single pulses in order to achieve

the most accurate measurements.

Application Example 1

Laser Pulse Width 50 ms

Maximum Energy 10J

Solution Choose a PM10

Application Example 2

Laser Pulse Width 300 ms

Maximum Energy 80J

Solution Choose a PM150 or

PM150-50C*

* Specic sensor choice depends upon aperture and mechanical

constraints.

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