Skip to main content

JB COS

Cosine Receptor for Spectroscopy

JB COS is a unique cosine receptor specifically designed for accurate measurement of solar irradiance.  Its high transmittance and innovative design reduces light loss significantly and allows an almost perfect cosine response.

Description

The JB COS cosine receptor is designed primarily for outdoor use. Typically, it is coupled with JB devices  such as the FloX and RoX systems for accurate measurement of solar Irradiance across the full hemisphere. The JB COS thread is designed to be used in conjunction with an SMA-terminated fiber optic cable.

The innovative JB COS allows high light throughput and provides an excellent cosine response. It is particularly suitable for measurements in the VIS NIR domain (400-1000 nm).  NIR diffusers are available upon request.

Cosine Receptor for Spectroscopy
data from JB COS product
vertical view of JB COS product

Specifications

  • Cosine Error

    < 10% at 80 degree

  • Spectral Range

    400 nm – 1000 nm

  • Dimension – Diameter

    10 mm

  • Dimension – Height

    30 mm

  • Field Of View (FOV)

    Dual FOV. Upwelling radiance 25°. Downwelling radiance 180°

FAQ

How to calibrate an optical channel equipped by JB COS?

To perform a radiometric calibration of a channel with the JB COS connected requires use of an integrating sphere, having a diameter at least of 1 cm. Cross calibration with another channel, or against an additional spectrometer, is optional.

How long the calibration will last in field installation?

This depends on local conditions. In dusty environments (e.g., agricultural fields, urban areas etc.) frequent maintenance is recommended by cleaning the optics with common optical cleaners. In clean environments, periodic cleaning (e.g., every 6 months) is recommended.

Can I remove JB COS and fix it back without loosing calibration?

YES. Removing the receptor and placing it back it has a very low impact, typically up to 2%.

JB COS product illustration

Publications

Iterative design of a high light throughput cosine receptor fore optic for unattended proximal remote sensing. Journal of Applied Remote Sensing. 2022.

Andreas Burkart et.al.
Discover more

Hyperspectral Measurement Devices