Comet 1K Hand Held Power Sensor with Display

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Overview

The Comet 1K portable power puck laser sensor has a 50 mm aperture. It can measure power from 20 to 1000 W by sampling a 10 s exposure of laser power. It has the spectrally flat broadband coating and covers the spectral range from 0.2 to 20 µm.

Measure heat rise from 10 s exposure to laser
Accurate, built in temperature compensation algorithm
Up to 1 kW power measurement
50 mm diameter aperture
The Comet 1K sensor is not under ISO/IEC 17025:2017 accreditation

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Products

		Compare	Model	Compatibility	sortOrder	rankScore	ranking	Drawings, CAD & Specs		Spectral Range	Aperture Size	Minimum Power	Maximum Average Power	Availability	Featured Item	Price		Brand
		7Z02702 Comet 1K Portable Thermal Power Puck Sensor, Comet, 0.02-1 kW, Ø50 mm, 0.2-20 µm $1,115 In Stock	7Z02702 Comet 1K Portable Thermal Power Puck Sensor, Comet, 0.02-1 kW, Ø50 mm, 0.2-20 µm	UNIVERSAL	0.0	1.0	0.0		0.0	0.2-20 µm	Ø50 mm	20 W	1 kW	In Stock		$1,115		Ophir

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Specifications

Product Name

Comet 1K
Spectral Range

0.2-20 µm
Aperture Size

Ø50 mm
Minimum Power

20 W
Maximum Average Power

1000 W
Maximum Average Power Density

4 kW/cm²

Maximum Energy Density <100 ns

0.3 J/cm²
Maximum Energy Density 2 ms

15 J/cm²
Dimensions

29 x 25 x 50 mm
CE Compliance

Yes
UKCA Compliance

Yes
China RoHS Compliance

Yes

Features

Meet the Comet family of Laser Power Probes

Meet the Comet family of Laser Power Probes -- accurate, low cost meters that are self-contained, and fast and easy to use in industrial settings.

Choosing a Thermal Sensor

In this short “Basics” video we review the use – and selection - of thermal sensors for measuring low, medium and high laser powers.

Thermal Power Sensor Accuracy

Ophir former CTO Dr. Ephraim Greenfield discusses the various factors that contribute to uncertainties in measurement when using Ophir laser power and energy meters.

Effects of Incidence Angle on Measurements

In this video, you will learn to what degree a beam’s incidence angle matters, and for which sensor types this should be taken into account.

Frequently Asked Questions

How should I clean my sensor?
Answer
First, clean the absorber surface with a tissue, using Umicore #2 Substrate Cleaner, acetone or methanol. Then dry the surface with another tissue. Please note that a few absorbers (Pyro-BB, 10K-W, 15K-W, 16K-W and 30K-W) cannot be cleaned with this method. Instead, simply blow off the dust with clean air or nitrogen. Don't touch these absorbers. Also, HE sensors (such as the 30(150)A-HE-17) should not be cleaned with acetone.

Note: These suggestions are made without guarantee. The cleaning process may result in scratching or staining of the surface in some cases and may also change the calibration.

What is the damage threshold of the thermal broadband coating and how does it compare with claims of other manufacturers?
Answer
We publish a nominal damage threshold for most of our thermal BB sensors as 20 KW/cm². Other manufacturers may quote higher numbers than this. In actuality, in one to one tests against competitors, our sensors show a higher damage threshold but the actual damage threshold depends on the total power as well as the power density. For very low powers such as 30 W, the damage threshold can be as high as 50 KW/cm² and at high powers such as 5 KW, it drops to 3 KW/cm². The Ophir sensor finder program takes account of these variations in its calculations.

Do I need to recalibrate my instrument? How often must it be recalibrated?
Answer
Unless otherwise indicated, Ophir sensors and meters should be recalibrated within 18 months after initial purchase, and then once a year after that.

Can a laser measurement depend on the distance from the laser to the sensor?
Answer
In theory, if a beam is completely parallel and fits within the aperture of a sensor, then it should make no difference at all what the distance is. It will be the same number of photons (ignoring absorption by the air, which is negligible except in the UV below 250nm). If, nevertheless, you do see such a distance dependence, there could be one of the following effects happening:
- If you are using a thermal type power sensor, you might actually be measuring heat from the laser itself. When very close to the laser, the thermal sensor might be “feeling” the laser’s own heat. That would not, however, continue to have an effect at more than a few cm distance unless the light source is weak and the heat source is strong.
- Beam geometry – The beam may not be parallel and may be diverging. Often, the lower intensity wings of the beam have greater divergence rate than the main portion of the beam. These may be missing the sensor's aperture as the distance increases. To check that you'd need to use a profiler, or perhaps a BeamTrack PPS (Power/Position/Size) sensor.
- If you are measuring pulse energies with a diffuser-based pyroelectric sensor: Some users find that when they start with the sensor right up close to the laser and move it away, the readings drop sharply (typically by some 6%) over the first few cm. This is likely caused by multiple reflections between the diffuser and the laser device, which at the closest distance might be causing an incorrectly high reading. You should back off from the source by at least some 5cm, more if the beam is not too divergent.
Needless to say, it’s also important to be sure to have a steady setup. A sensor held by hand could easily be moved around involuntarily, which could cause partial or complete missing of the sensor’s aperture at increasing distance, particularly for an invisible beam.

Frequently Asked Questions

How should I clean my sensor?
Answer
First, clean the absorber surface with a tissue, using Umicore #2 Substrate Cleaner, acetone or methanol. Then dry the surface with another tissue. Please note that a few absorbers (Pyro-BB, 10K-W, 15K-W, 16K-W and 30K-W) cannot be cleaned with this method. Instead, simply blow off the dust with clean air or nitrogen. Don't touch these absorbers. Also, HE sensors (such as the 30(150)A-HE-17) should not be cleaned with acetone.

Note: These suggestions are made without guarantee. The cleaning process may result in scratching or staining of the surface in some cases and may also change the calibration.

What is the damage threshold of the thermal broadband coating and how does it compare with claims of other manufacturers?
Answer
We publish a nominal damage threshold for most of our thermal BB sensors as 20 KW/cm². Other manufacturers may quote higher numbers than this. In actuality, in one to one tests against competitors, our sensors show a higher damage threshold but the actual damage threshold depends on the total power as well as the power density. For very low powers such as 30 W, the damage threshold can be as high as 50 KW/cm² and at high powers such as 5 KW, it drops to 3 KW/cm². The Ophir sensor finder program takes account of these variations in its calculations.

Do I need to recalibrate my instrument? How often must it be recalibrated?
Answer
Unless otherwise indicated, Ophir sensors and meters should be recalibrated within 18 months after initial purchase, and then once a year after that.

Can a laser measurement depend on the distance from the laser to the sensor?
Answer
In theory, if a beam is completely parallel and fits within the aperture of a sensor, then it should make no difference at all what the distance is. It will be the same number of photons (ignoring absorption by the air, which is negligible except in the UV below 250nm). If, nevertheless, you do see such a distance dependence, there could be one of the following effects happening:
- If you are using a thermal type power sensor, you might actually be measuring heat from the laser itself. When very close to the laser, the thermal sensor might be “feeling” the laser’s own heat. That would not, however, continue to have an effect at more than a few cm distance unless the light source is weak and the heat source is strong.
- Beam geometry – The beam may not be parallel and may be diverging. Often, the lower intensity wings of the beam have greater divergence rate than the main portion of the beam. These may be missing the sensor's aperture as the distance increases. To check that you'd need to use a profiler, or perhaps a BeamTrack PPS (Power/Position/Size) sensor.
- If you are measuring pulse energies with a diffuser-based pyroelectric sensor: Some users find that when they start with the sensor right up close to the laser and move it away, the readings drop sharply (typically by some 6%) over the first few cm. This is likely caused by multiple reflections between the diffuser and the laser device, which at the closest distance might be causing an incorrectly high reading. You should back off from the source by at least some 5cm, more if the beam is not too divergent.
Needless to say, it’s also important to be sure to have a steady setup. A sensor held by hand could easily be moved around involuntarily, which could cause partial or complete missing of the sensor’s aperture at increasing distance, particularly for an invisible beam.