3A-IS | Laser Photodiode Sensors | Power Sensors - Ophir

3A-IS

7Z02404

The 3A-IS是一款积分球光电二极管激光测量传感器,用于角度大至+/-40°的发散光束。具有12mm孔径,功率测量范围为1µW * 3W。光谱覆盖范围为0.35 - 1.1µm。可提供自吸收式标定附件AUX-LED。该传感器配备一根1.5米电缆,用于连接至一个仪表或PC接口。

  • Ø12mm
  • 350-1100nm
  • 1µW-3W
  • 68 L x 95 W x 46 D (mm)
  • 500µJ
  • 0.2kW/cm²
  • 0.2 s
  • 3W
  • N.A.
  • N.A.
  • CE, China RoHS
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Integrating spheres are used when you have divergent light sources. How do they work?

Integrating Sphere Theory
Integrating spheres are used when we have divergent light sources. As shown in the illustration, an integrating sphere has its inner surface coated with a surface that highly reflects (typically 99%) in a scattering, nonspecular way. Thus when a divergent beam hits the walls of the integrating sphere, the light is reflected and scattered many times until the light hitting any place on the walls of the sphere has the same intensity. 

A detector placed in the sphere thus gets the same intensity as anywhere else and the power the detector detects is thus proportional to the total incident power independent of the beam divergence. (The detector is so arranged that it only sees scattered light and not the incident beam). An ideal integrating sphere has a surface with reflective properties are Lambertian. This means that light incident on the surface is scattered uniformly in all directions in the 2pi steradians solid angle above the surface. The surface used by Ophir closely approximates a Lambertian surface.

3A-IS Series
The 3A-IS series has two 50mm integrating spheres in series with a photodiode detector. The two series spheres scramble up the light very well thus giving output very independent of incident beam divergence angle. The two spheres in series also insure that the light hitting the detector is greatly reduced in intensity thus allowing use up to 3 Watts even though photodiodes saturate at about 1mW. There are two models, the 3A-IS with a silicon photodiode for 400 – 1100nm and the 3A-ISIRG with an InGaAs detector for 800 – 1700nm

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Are there any special problems with the calibration stability of integrating sphere sensors?

The Ophir integrating sphere sensors, models 3A-IS and 3A-IS-IRG have a white diffuse reflecting coating on the inside of the integrating sphere. The sensitivity of the sensor is quite sensitive to the reflectivity of the coating. If the coating absorption goes up 1%, it can cause a 5% change in reading. Therefore, care must be taken not to soil or damage the white coating of the sensors. Also it may be a good idea to send the sensors for recalibration yearly.

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When using the fiber optic adaptor, how do we handle power loss due to the fiber relative to calibration?

All Ophir power meters, including photodiode power meters, have an air gap between the fiber tip and the sensor. Therefore they measure the power emitted by the fiber into the air and do not take into account any reflection losses there are in the fiber. Therefore, if in actual use, the fiber will be coupled with no loss to another element, then the losses should be added to the reading. These losses are usually about 4%. Thus if the reading on the Ophir meter is say 100mW, then in lossless use, the real power will be 104mW.

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What is the purpose of the auxiliary LED accessory for the 3A-IS integrating sphere?

The auxiliary LED is used to increase accuracy in cases where the source under measurement is reflective or protrudes into the integrating sphere. The auxiliary LED is used to measure this effect and calibrate it out.

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The auxiliary LED emits at 390nm, while the measured UV LED can emit between 350nm and 400nm. Will this increase the measurement error?

For the most demanding accuracy requirements, a broadband source is used for the auxiliary lamp, and a spectrometer monitors the effect of self-absorption across the spectrum. For UVLEDs, in the limited spectral range of 350nm-400nm, using the auxiliary LED at 390nm is an efficient solution, and the error due to self-absorption is reduced from up to ±20% to up to ±5%.

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Do I need to recalibrate my instrument? How often must it be recalibrated?

Unless otherwise indicated, Ophir sensors and meters should be recalibrated within 18 months after initial purchase, and then once a year after that.

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Among the Integrating Sphere accessories offered, there are “Port Plugs” (white), and “Port Covers” (black). What’s the difference?

An unused port should be closed, to prevent unwanted light from entering the sphere. Closing it with a diffuse white port plug, however, adds the surface area of that plug to the (diffuse white) effective area of the sphere that is doing the “integrating”. For a calibrated integrating sphere sensor, this change in the behavior of the sphere changes its calibration, and results in incorrect readings. In such applications, a black “Port Cover” should be used.

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Calibration Factors Calibration Factors
Measuring beams coming out of a fiber Measuring beams coming out of a fiber Measuring beams coming out of a fiber

When you measure a beam coming out of a fiber, there are some parameters that have a different meaning than they do when referring to "regular" beam measurements. This video clarifies some issues you'll need to keep in mind.

How to Choose the Right Sensor Using the LED Sensor Finder How to Choose the Right Sensor Using the LED Sensor Finder How to Choose the Right Sensor Using the LED Sensor Finder

Choosing the right sensor to measure LEDs or similar sources, whose beams are usually divergent and have a broadened spectrum, can be tricky. The LED Sensor Finder will help you get it right.

When a power/energy meter is in "Calibrate" mode, various "Factors" are displayed to the user. This video explains the meaning of each of these factors.

Tutorials and Articles

Integrating Sphere Fundamentals an Applications

Introduction 阅读更多...

Measuring Power of Divergent Beams with Integrating Sphere Sensors

An integrating sphere is used to measure a divergent light source. As shown in the illustration, an integrating sphere has its inner surface coated with a surface that highly reflects (typically 99%) in a scattering, nonspecular way. Thus when a divergent beam hits the walls of the integrating sphere, the light is reflected and scattered many times until the light hitting any place on the walls of the sphere has the same intensity.

 阅读更多...

Measuring LED Power and Irradiance with Calibrated Photodiodes

In many industries LEDs are replacing traditional broadband light sources such as mercury, deuterium, Xenon, and quartz-halogen lamps. Systems and applications transitioning to LEDs are reengineered in terms of optics, electronics, heat management and more. Similarly, the equipment used by professionals to measure the output of these sources needs to be fitted for measuring LEDs.

 阅读更多...

Accessories

Customers that purchase the above items also consider the following items. Ophir-Spiricon meters and sensors include a standard manufacturers warranty for one year. Add a one year Extended Warranty to your meter or sensor, which includes one recalibration.
  • SC Fiber Adapter

    SC Fiber Adapter

    7Z08227
    This fiber adapter is used for connecting power and energy sensors to a standard SC-type fiber. Many sensors need an additional mounting bracket to connect to all fiber adapters. More information can be found in the datasheet below.
  • ST Fiber Adapter

    7Z08226
    This fiber adapter is used for connecting power and energy sensors to a standard ST-type fiber. Many sensors need an additional mounting bracket to connect to all fiber adapters. More information can be found in the datasheet below.
  • FC Fiber Adapter

    FC Fiber Adapter

    7Z08229
    This fiber adapter is used for connecting power and energy sensors to a standard FC-type fiber. Many sensors need an additional mounting bracket to connect to all fiber adapters. More information can be found in the datasheet below.
  • SMA Fiber Adapter

    SMA Fiber Adapter

    1G01236
    This fiber adapter is used for connecting power and energy sensors to a standard SMA-type fiber. Many sensors need an additional mounting bracket to connect to all fiber adapters. More information can be found in the datasheet below.
  • 3A-IS Fiber Adapter Bracket
    A mounting bracket is needed to connect most power and energy sensors to a fiber adapter (SC, ST, FC or SMA). This bracket can be used for integrating sphere models 3A-IS and 3A-IS-IRG.

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