Integrating Sphere Power Meter
积分球功率计
- SKU OPM-0005
- Optical Power Meters
- CE (to be confirmed)
- ISO 9001 manufacturing (to be confirmed)
Price on request — FOB / CIF quoted per order
Prices depend on configuration, quantity and destination port.
Key specifications
| Power range | 1 µW to 20 W |
|---|---|
| Wavelength range | 350–1100 nm |
| Sphere diameter | 100 mm |
| Input port size | 12 mm |
| Accuracy | ±5% of reading |
| Uniformity | ±2% |
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By Lab Manufacturers China Technical TeamLast reviewed Standards: IEC 60825-1, ISO 11554, IEC 61315
What is the Integrating Sphere Power Meter?
An integrating sphere power meter collects light from divergent or high-power beams and averages it inside a coated sphere before measurement. It is used for laser diodes, LEDs and fibre sources where direct sensors would saturate or be damaged.
What is the Integrating Sphere Power Meter?
An integrating sphere power meter collects light from divergent or high-power beams and averages it inside a coated sphere before measurement. It is used for laser diodes, LEDs and fibre sources where direct sensors would saturate or be damaged.
Overview
An integrating sphere power meter consists of a hollow sphere coated with a highly diffuse reflective material such as barium sulfate or PTFE. Light entering through an input port undergoes many reflections, creating a uniform radiance at the detector port regardless of beam divergence or position. This makes the measurement insensitive to alignment and protects the detector from high power density. Sphere diameter, port size and coating determine throughput and power handling. The detector, usually a photodiode, is calibrated against a traceable standard, and the sphere can be configured with attenuation or multiple ports for different sources.
How does it work?
An optical power meter converts incident light into an electrical signal with a sensor whose spectral response is known. Photodiodes are fast and sensitive and suit low to moderate power; thermopiles absorb light and measure the resulting temperature rise for higher powers and broad wavelength coverage; pyroelectric sensors respond to pulsed energy. The signal is amplified, digitized and displayed in watts, dBm or relative units. Calibration against a traceable reference sets the responsivity, and the meter applies wavelength correction when the source differs from the calibration wavelength. Attenuators, integrating spheres and diffusers adapt the sensor to high power or divergent beams. Linearity, noise floor and response time define the usable measurement range.
What are the key features?
- Diffuse reflective coating for uniform response
- Insensitive to beam alignment and divergence
- Protects detectors from high power density
- Multiple ports for different sources and detectors
- Detector calibrated against traceable standards
What are the technical specifications?
A typical integrating sphere power meter configuration offers power range of 1 µW to 20 W, wavelength range of 350–1100 nm, sphere diameter of 100 mm, input port size of 12 mm, accuracy of ±5% of reading and uniformity of ±2%. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.
Which applications is it used for?
The Integrating Sphere Power Meter is used in laser diode and LED power measurement, fibre-coupled source testing, total radiant flux measurement and optical instrument and lamp calibration. Across the wider Optical Power Meters class, laboratories also deploy it for laser output power verification, fibre-optic link loss and attenuation testing and LED and display source characterization.
Which standards and certifications apply?
Relevant standards and methods include IEC 60825-1, ISO 11554, IEC 61315, ISO 13694 and IEC 61010-1. Certification candidates for this model are CE and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.
Keep sensors clean and never exceed the specified maximum power or power density, which can damage the absorber permanently. Allow warm-up for stable readings and observe the recommended zeroing before low-level measurement. Calibration should be traceable and repeated at intervals defined by use and the quality system, typically annually. Follow laser safety requirements, including eye protection, beam enclosures and controlled areas, and mark the maximum permissible exposure for the setup. Store sensors with protective caps and document calibration certificates and corrections.
How do I select the right Integrating Sphere Power Meter?
Choose an integrating sphere meter for divergent beams, high power density or sources whose alignment varies. Match the sphere diameter and port size to the beam and power level, and confirm the wavelength range and coating suit the application. Because response is averaged, the instrument is well suited to total flux measurement but not to beam profile measurement.
How does it compare with other Optical Power Meters variants?
Start with the sensor type because it sets the power range, wavelength coverage and response time. Choose a photodiode meter for low-power, high-sensitivity work in the visible and near-infrared, a thermopile meter for medium to high laser power and broad wavelengths, and a pyroelectric meter for pulsed sources. For free-space beams, integrating spheres handle divergence and high power density; for fibre testing, choose a meter with the right connector and calibrated telecom wavelengths. Then confirm the required accuracy, resolution, wavelength correction range, display units and connectivity to records or control systems.
Full specifications
| Power range | 1 µW to 20 W |
|---|---|
| Wavelength range | 350–1100 nm |
| Sphere diameter | 100 mm |
| Input port size | 12 mm |
| Accuracy | ±5% of reading |
| Uniformity | ±2% |
| Coating | PTFE diffuse reflector |
| Detector | Silicon photodiode |
| Power supply | 12 V DC |
| Data interface | USB |
Indicative values for this product class. Final specifications are confirmed on the quotation and in the calibration documents supplied with the instrument.
Applications
- Laser diode and LED power measurement
- Fibre-coupled source testing
- Total radiant flux measurement
- Optical instrument and lamp calibration
Key features
- Diffuse reflective coating for uniform response
- Insensitive to beam alignment and divergence
- Protects detectors from high power density
- Multiple ports for different sources and detectors
- Detector calibrated against traceable standards
Frequently asked questions about Integrating Sphere Power Meter
An integrating sphere spreads the beam over a large diffuse surface, so the detector sees low, uniform power density and the reading is insensitive to beam position and divergence. This protects the detector and gives repeatable total-flux measurements for LEDs and laser diodes.
The coating reflectance and the detector response set the useful range. PTFE coatings work well from the ultraviolet to the near-infrared, while some coatings degrade in the deep ultraviolet. Beyond about 1100 nm, a different detector such as InGaAs is needed.
The diffuse coating is delicate and should not be touched. Clean only the input window or port with a soft cloth, and keep the sphere closed when not in use to prevent dust ingress. Follow the manufacturer procedure for coating renewal, since contamination reduces reflectance and biases readings.
A photodiode sensor is fast and sensitive and suits low-power measurements over a limited wavelength range. A thermopile absorbs light and measures temperature rise, covering broad wavelengths and higher powers but with slower response. The choice depends on power level and response requirements.
Sensor responsivity varies with wavelength, so a meter calibrated at one wavelength can read incorrectly at another. Modern meters store a responsivity curve and apply a correction when the user enters the source wavelength. Using uncorrected readings introduces errors of several percent.
Use a sensor rated above the expected power and power density, attenuate or expand the beam if necessary, and follow IEC 60825-1 safety practice. Avoid direct viewing, control the beam path and use an integrating sphere for high-power or divergent beams to spread the energy.
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