Optical Measurement | Light Measurement | Remote Sensing
JETI spectraval 1501 Spectroradiometer
The JETI spectraval 1501 is a versatile spectroradiometer configured as standard for measuring spot spectral radiance or luminance. By attaching an optional cosine diffuser, the spectraval can also be used to measure spectral irradiance and illuminance. Being a spectroradiometer, the spectraval 1501 measures the spectral radiance or irradiance of the light source or display between 380 and 780 nm (380 – 1000 nm for the NIR model) and accurately computes all of the derived photometric and colorimetric parameters, including luminance, illuminance, CIE chromaticity, correlated colour temperature (CCT) and colour rendering index (CRI), as well as circadian and other radiometric parameters. Accessory focussing optics are available to reduce the measurement area down to as small as 0.5mm diameter.
The spectraval 1501 requires a connection via Bluetooth or USB to a PC (laptop, tablet etc) operating under JETI’s LiVal software. Alternatively, the 1501 can be configured with an ethernet (LAN) interface. For the ultimate in portability, consider instead the spectraval 1511 which features an integrated display, onboard processing and data storage and avoids the need to carry a computer around with you.
Please note that accessory optics (cosine diffusers and close-up lenses) are able to be quickly and easily swapped by the operator, depending upon the type of measurement to be performed. If you intend using any focussing (close-up) lenses with your spectraval 1501, even if you don’t buy them with the instrument, you should order the spectraval 1501 “Focus” model that is configured to allow for the use of focussing optics at a later date.
Key features
- Fast measurement of spectral radiance
- Radiometric software JETI LiVal included
- Optimized operation routines
- Marking of measuring circle
- Piezo-electric shutter for dark signal compensation
- Bluetooth and USB interfaces
- USB or battery powered
- Suited for HDR (luminance values up to 140 000 cd/m² can be measured)
- Implementation into customer specific applications possible using:
- Radiometric DLLs (Windows applications) or
- Serial commands (SCPI-like syntax) (Windows and Linux applications)
Spectral radiance & luminance measurements
When operated in spot radiance/luminance mode, the spectraval 1501 has a 1.8° measurement field-of-view. Accessory focussing optics are available to reduce the measurement area down to 3.0, 1.0 or 0.5 mm diameter. The spectraval 1501 features a convenient, integrated laser diode pointer that projects a red circle onto the target object to clearly denote the measurement zone. Remember that as with all spot photometers, colorimeters and spectroradiometers, it is essential that the measurement spot falls well within the lit area of the object under test, otherwise large errors could ensue. This is particular important when testing the luminance of small objects such as switch legends or vehicle instrument panels and controls.
Spectral irradiance & illuminance measurements
The spectraval 1501 is configured and calibrated as standard to measure spot spectral radiance and luminance. By simply attaching an optional cosine diffuser to the input of the Spectraval, it can also be used to measure spectral irradiance and illuminance. Best of all, the spectraval “knows” when you have the cosine diffuser attached and adjusts measurement parameters and calibration accordingly.
Available models
- spectraval 1501: visible wavelength range (380 – 780 nm)
- spectraval 1501-NIR: extended wavelength range to near-infrared (380 – 1000 nm)
- spectraval 1501-HiRes: visible wavelength range (380 – 780 nm) with high spectral resolution (HiRes: 2.0 nm)
