UDT Instruments, a division of Gamma Scientific, offers an extensive selection of radiometers, radiance meters, irradiance meters and optical sensors to meet your radiometric test and measurement needs.
Combining our wide range of optometers, radiometric sensors and accessories, with our state-of-the-art calibration facilities, allows our applications engineers to assemble and configure custom radiometer systems for nearly any project.
Radiometry is the measurement of radiation in the electromagnetic spectrum. This includes ultraviolet (UV), visible and infrared (IR) light.
Radiometric measurements quantities include: Radiant Flux (Watt); Radiant Intensity (W/sr); Irradiance (W/m2); Radiance (W/m2sr)
- Radiant Flux Measurements (in units of watts) are performed with an instrument known as a flux meter or optical power meter. This type of testing is typically used for characterizing the total output of sources such as:Lasers, LEDs, Lamps and Fiber-Optic Systems
- Irradiance Measurements (in units of W/m2) are performed with an irradiance meter. This involves the measurement of the radiant flux incident upon a surface, per unit area. Such measurements are important in the following fields: Medical, Biological and Remote Sensing
- Radiant Intensity Measurements (in units of W/sr) are performed with an instrument that may be described as an optical intensity meter. This type of testing is typically used for characterizing the output of a relatively small source in a particular direction. Typical devices under test include: LEDs, UV Lamps and IR Lamps
- Radiance Measurements (in units of W/m2sr) are performed with a radiance meter. This involves measuring the light emitted in a particular direction by a given spot on the surface of an extended source. Such measurements are important in fields such as: Remote Sensing, Avionics and Night Vision
Specifying a Radiometer System
Selecting a properly calibrated radiometric head and the right readout device are important in obtaining accurate results.
The sensor head converts electromagnetic radiation into an electrical signal. The readout device then receives this signal and interprets it. A properly calibrated measurement system will measure the light source and display the measurement in the appropriate optical units.
The readout unit should be selected according to its features, and the detector head should be selected according to its power measurement range, wavelength calibration and size. The two matched together will accurately measure the source in the correct optical units.
Radiometer and Radiometry Resources from Gamma Scientific
- An Introduction to Radiometry
- Radiometer System Configurations(PDF)
- How to Characterize a Spectral Radiometer
Gamma Scientific Radiometers
flexOptometer Benchtop Radiometer
High-performance radiometer designed to operate as a stand-alone instrument or computer-controlled radiometric measurement system. Available with a single head, or up to four interchangeable detector heads. Electronic design is based on Gamma Scientific’s TIA-3000 measurement system, which serves as the primary working standards of several National Standards Labs. Laboratory grade accuracy and durability ensures that the flexOptometer will operate in the most rigorous production line environments.
The NVG-4040 has a unique ability to perform NVIS-A, NVIS-B and NVIS-C radiance measurements. Lightweight, portable and cost-effective, it conforms to MIL-L-85762A and MIL-STD-3009. The NVG-4040 is optimized for a full range of photopic applications, and is ideally suited for measuring displays and instrument panels used with night-vision goggles.
The model 471 handheld radiometer is designed to be used for radiometric measurement in the laboratory or field testing environment. It features high-accuracy measurements, wide dynamic range, high-speed update rate and a large calibration capacity. All calibrations are traceable to the National Institute of Standards Technology (NIST).
Detector-based absolute standards for capturing a wide range of measurements. Configurations include thermo-electrically cooled silicon and indium gallium arsenide (InGaAs) detectors with options for radiometric correction filters, flat-response filters, trap detectors and ANVIS-compatibility filters. Standard calibrations, directly traceable to NIST, are available for any configuration of the TIA-3000 from Gamma Scientific’s world-renowned standards lab.
Radiometric Sensors from UDT Instruments
UDT Instruments produces precision radiometric sensors for diverse applications and are ideally suited for OEMs and value-added resellers. UDTi radiometric sensors provide industry leading accuracy, and each sensor from UDT Instruments includes a NIST-traceable calibration from our NVLAP accredited laboratory.
uRAD-LL Handheld Radiance Meter
This radiance meter bundle combines a filtered silicon sensor with a fixed-focus lens to provide non-contact radiance measurement of an area on the surface of an extended source. Spot size is dependent working distance, which ranges from 17 mm to infinity.
This irradiance meter bundle combines a broadband silicon sensor with a benchtop optometer to provide simple and accurate measurement of irradiance. The system’s calibration is programmed into the benchtop optometer. Measurement results are displayed by the optometer in units of Watts per square meter (W/m2), and digital data can be acquired directly via PC.
Photosensors can be equipped with various types of optical accessories to form sensor head assemblies suitable for diverse types of measurements. UDT Instruments offers a range of preconfigured sensor heads, as well as the following optical components to enable configuration of custom sensor heads for the measurement of flux, illuminance, irradiance, intensity, luminance, or radiance.
Flexoptometer (Radiometer/Photometer) Specifications
| Electronic | Integrator |
|---|---|
| Eight Photometric/Radiometric Ranges | Four Integrate Ranges | Range-to-Range Linearity < 0.1% for most ranges (< 0.25% for most sensitive range) | Range-to-Range Linearity < 0.1% for most ranges (< 0.25% for most sensitive range) |
| Sensitivity: 10-15; to 10-3 Amps | Sensitivity: 10-14 to 10-3 coulomb | Resolution: 1×10-15 Amps | Decay Error: analog-approx. 0.01% / sec |
| Dark Current Suppression: 50 nA Max | Digital-holds reading indefinitely | Noise: < 3×10-15 Amps |
| Frequency Roll-off: < 10 Hz on most sensitive range | |
| Photometric/Radiometric Ranges | |
| Photometric Units | Sensor and Range | Luminous Intensity | Model 424: 0.00001 mcandelas to 10000 candelas |
| Illuminance | Models 211 and 268P: 0.00001 milliLux to 10000 Lux | Luminance | Model 2153: 0.0001 millicandela/m² to 100000 candela/m² |
| Illuminant Energy | Models 211 and 268P: 0.00001 milliLux*seconds to 10 Lux*seconds | Radiometric Units | Sensor and Range |
| Irradiance | Models 221 and 247: 0.000001 nanoWatts/cm² to 1000 microWatts/cm² | Radiant Energy | Models 221 and 247: 0.00001 nanoJoules/cm² to 1 microJoules/cm² |
| Radiance | Model 247 with 1153: 0.00001 nanoWatts/cm²/steradian to 10 milliWatts/cm²/steradian |
| Sensors and Accessories | |
| UV/Visible | Photometric | 211: Silicon Sensor (350-1100nm) 1cm² active area | 211: Photometric Sensor with Cosine Receptor (Illuminance) | 222: Silicon Sensor (200-400nm) 1 cm² active area | 263: Miniature Photometric Sensor (Illuminance) | 228: Silicon Sensor for HeNe Laser (633nm) BHR Compliance | 268P: Low-Profile Photometric Sensor with Cosine Receptor | 260: Miniature Silicon Sensor (350-1100nm) 0.34 cm² active area | 2153: Photometric Sensor with 13 degree FOV Lens (Luminance) | 268BLUE: Low Profile Blue Optimized 450 nm Sensor | 265: Photometric Display Brightness Sensor (Luminance) | 268UVA: Low Profile UVA Optimized Sensor Head (365 nm) | 268M: Mini Photometric Display Brightness Sensor (Luminance) | 268UVC: Low Profile UVC Optimized Sensor Head (254 nm) | 424: LED Photometric Sensor (CIE 127 Luminous Intensity) |
| Radiometric | Laser Power | 247: Flat Response Sensor | 264: Miniature Attenuated Laser Sensor Head | 262: Miniature Flat Response Sensor | 268LP: Low Profile Laser Sensor Head | 264: Attenuated Laser Sensor Head | Infared | 268R: Low Profile Flat Response Sensor | 261: Miniature Infrared Germanium Sensor (800-1750nm) | 424R: LED Radiometric Sensor (CIE 127 Luminous Intensity) | 280: Miniature Infrared InGaAs Sensor (800-1750nm) |
| General Specifications | |
| Automatic/Manual ranging | Microprocessor Controlled Functions |
| High Voltage circuit for photomultipliers (300-1500 Volts) | Thermo-electric coolers for Sensor and filter stabilization |
| USB, RS-232, RS-485 and IEEE-488.2 Communications | Analog Output |
| Power Input: 12.0 volts DC | Operating Temperature Range: 0 to 50° C |
| Humidity: 0% to 95% RH non-condensing | |
