MKS Ophir BeamWatch AM Kurzanleitung

BeamWatch AM User Note

Document No. 50394-001

Rev H

3-Feb-2020

Page 1

BeamWatch AM

User Notes

For Sales, Service or Technical Support

Phone: (435) 753-3729

Fax: (435) 753-5231

Service Email

service@us.ophiropt.com

Sales Email

sales@us.ophiropt.com

Ophir-Spiricon, LLC

3050 North 300 West

North Logan, Utah 84341

BeamWatch AM User Note

Document No. 50394-001

Rev H

3-Feb-2020

Page 2

Dear Ophir-Spiricon Customer,

Thank you for your recent purchase of the BeamWatch AM system.

At Ophir-Spiricon we strive to provide the highest level of leading edge photonic measurement technology and

service possible. We hope that your experience with us is a pleasant one, and anticipate the relationship we

build will serve your photonic measurement needs for years to come.

As a valued customer, your comments and opinions are always very important to us. If you have any

concerns, questions, or comments, bring them to our service department’s attention. We are ready to help

with everything from basic setup to working with you to find solutions for your most complex photonics

measurement needs.

Please let us know if there is any way we can be of service. Thank you once again for your business.

Sincerely,

Ophir-Spiricon, LLC

3050 North 300 West

North Logan, UT 84341, USA

Tel 435-753-3729

Fax 435-755-5231

www.ophiropt.com/photonics

BeamWatch AM User Note

Document No. 50394-001

Rev H

3-Feb-2020

Page 3

How to Use this Guide

Symbol Notation

Indicates general information that poses no risk.

Indicates important information about the product with little or no risk.

Indicates warning information. Failure to follow instruction may result in harm to the user or product

damage.

BeamWatch AM User Note

Document No. 50394-001

Rev H

3-Feb-2020

Page 4

Safety

While the BeamWatch AM alone does not present the user with any safety hazards, this instrument is intended

for use with laser systems. Therefore, the user should be protected from any hazards that the laser system

may present. The greatest hazards associated with laser systems are damage to the eyes and skin due to laser

radiation.

Optical Radiation Hazards

BeamWatch AM is designed for use with high power lasers and therefore safety precautions must

be taken. Users must be protected against accidental exposure. Exposure to personnel other than

the user must also be considered. Hazards include direct beam exposure and reflected radiation.

Protective eye shields and clothing must be worn.

Electrical Hazards

BeamWatch AM utilizes only low voltages, derived from the USB and camera power supplies. Thus

there is little risk of electrical shock presented to the user.

When installing or removing any hardware from a PC, the power to the computer should always be

disconnected.

The computer should always be operated with its covers in place and in accordance with its

manufacturer’s recommendations.

The computer should always be operated with a properly grounded AC power cord.

BeamWatch AM User Note

Document No. 50394-001

Rev H

3-Feb-2020

Page 5

Chapter 1 General Information

Introduction

BeamWatch AM is the next version in Ophir-Spiricon’s family of non-interfering beam monitoring systems.

Designed specifically for the additive manufacturing industry, BeamWatch AM sports a new compact design

and provides real-time measurement of the beam at the working plane location. Measurement of the beam’s

caustic is taken by imaging the Rayleigh scatter of the beam from the side. A dust shutter is implemented to

prevent contamination of internal components and can only be opened when the purge gas is flowing. A light

trap and power sensor are also included in the design to fully contain and provide absolute power

measurement of the beam.

BeamWatch AM provides simultaneous measurements of multiple profiles along the beam caustic in the

camera field-of-view (FOV). Real-time measurements are performed at video rates. They include:

•waist (focus spot) width and location

•focal shift

•centroid

•M2or K

•divergence

•Beam Parameter Product

•Rayleigh length

•absolute power

Real-time performance also allows for measurement of dynamic focal shift during laser startup.

The technique is based on Rayleigh scattering of laser light by oxygen and nitrogen molecules in the air as the

beam propagates. Measurement of this scattered light provides an equivalent slit scan of the laser beam in the

direction of the view observed. The scattered light is measured using conventional CCD cameras and image

capture systems.

BeamWatch AM has USB connectivity to Windows personal computers for data acquisition, analysis, and

display.

Make sure to save the BeamWatch AM Shipping case and key. This makes it easier to ship when the

unit needs to be recalibrated.

BeamWatch AM User Note

Document No. 50394-001

Rev H

3-Feb-2020

Page 6

User documentation:

•BeamWatch AM User Notes

•Alignment tool User Notes

•Calibration Certificate

•Quick Start Guide

BeamWatch AM

Power Supply Cable

Power Supply Adapter

Software Installation

Disc

Interlock Cable

Y-Distributor for

Interlock

Juno USB Interface

Wiring Harness:

•Power Sensor Cable

•Polyurethane Tubing

•Power Cable

•USB 3.0 Cable

•5/32” - 1/4” Air Hose Adapter

Equipment

BeamWatch AM User Note

Document No. 50394-001

Rev H

3-Feb-2020

Page 7

Additional 1/4" Air Hose

(10ft)

Retaining Ring Pliers

Halo Aperture

Replacement Filters

(x4)

Alignment Tool

BeamWatch AM User Note

Document No. 50394-001

Rev H

3-Feb-2020

Page 8

Getting to know BeamWatch AM

LED Notification Lights

Three LED lights on the top of the BeamWatch AM unit provide information at a glance about operation.

The Power Indicator LED shines green when the unit is receiving power.

The Shutter Indicator LED shines green when the shutter is open and red when the shutter is closed. The

shutter cannot open without the purge gas connected and flowing.

The Fan Indicator LED shines green when the fan is active and does not shine when the fan is inactive. The

fan is the primary method of cooling when the unit gets too hot. When the unit gets too hot a warning

appears in the software. The fan can only be turned on from the software.

The shutter cannot be open when the fan is running and vice-versa.

BeamWatch AM User Note

Document No. 50394-001

Rev H

3-Feb-2020

Page 9

Specifications

Beam Profiling

Wavelength

1060-1080 nm

Minimum Power density

1.5 Megawatts/cm2

Minimum Focus Spot

50 microns

Maximum Beam diameter at

entrance

6 mm

(4.5 mm using the Halo Aperture)

Communication to PC

USB 2.0 & USB 3.0

Power

100-240 Volts AC 50/60Hz

Particulate Purge

Clean dry gas, 3-8 SLPM (35-100 PSI /

250-650 kPa). 1/4" hose fitting included.

Beam Divergence

15-60 mrad

Field of View

11.26mm x 2.99mm

Power Meter/Beam Dump

Measured Power

50 W to 1000 W

Maximum Power Exposure

1000 W for 2 minutes (120 kJ)

Precision

±3%

Cool-down Time

20 minutes with fan cooling if used to

maximum exposure

General

Weight

17 lbs

Dimensions

7.03in x 4.96in x 7.16in

178.57mm x 126mm x 181.92mm

BeamWatch AM User Note

Document No. 50394-001

Rev H

3-Feb-2020

Page 10

Operating Space

The graphic below gives a visual indication of the recommended operating space for BeamWatch AM. If

BeamWatch is operated outside of this space, it may be difficult to see the curvature of the caustic or the

beam may be large enough at the edges of the image that it is out of focus.

•Best results yield the strongest measurements and may be ISO when 3 Rayleigh lengths can be seen

by the camera’s detector.

•Acceptable results do not meet ISO requirements, but can still be strong, accurate measurements.

•Avoid applying lasers that fall within the Danger Zone as these results may lead to damaging fine

components in the BeamWatch AM unit.

In some cases results may fall within the Best Results area of the plot, but not state ISO. If this occurs, the

build plate location can be adjusted so the appropriate amount of Rayleigh lengths can be seen. Only make

adjustments after following the standard setup procedure and achieving an initial understanding of the beam.

The calibrated distance is measured to the center of the FOV and the detector is approximately 11mm

vertically. The build plane location can be adjusted ±5mm with the working plane still in the FOV.

If the beam focus is stable and does not experience a significant focal shift, the best practice for reaching ISO

compliance is to lower the build plate location farther than the calibrated distance by a maximum of 5mm. This

will cause the focal point to occur higher in the detector’s FOV and prevent any possible damage to the turning

mirror.

If the focal point shifts outside of the FOV then the build plate location can be raised a maximum of 5mm from

the calibrated distance to attempt to capture the entire focal shift. If the beam’s focal point falls outside of the

FOV the result accuracy is degraded.

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