li-190sa quantum sensor li-190sa quantum sensor

OPTICAL ACCESSORIES
1800-12S External Integrating Sphere: With the 1800-12S, the
LI-1800 becomes an even more powerful integrating sphere
based system for measurements ranging from total reflectance
and transmittance to color measurements of objects. Whether
you’re measuring leaf spectral properties in the field, or quality
control, the 1800-12S provides the portability to meet all your
measurement needs.
1
2
3
For measurements on thin samples, such as leaves, paper, or
cloth, the samples can be clamped onto the sample port for measurement.
For surface reflectance and color measurements of
larger objects, the sample clamp can be removed and the integrating
sphere placed directly on the object’s surface.
Measurements are taken by placing the illuminator in the reference
port and taking a reference scan with the LI-1800. Barium
sulfate (BaSO 4 ) is the reference material and is also used to coat
the walls of the 1800-12S. After a reference scan, the illuminator
is moved to the reflectance or transmittance port so the
source can shine on or through the object (respectively).
The reflectance or transmittance data files stored in the LI-1800
are then divided by the reference data file to produce a file
containing the total (diffuse plus specular) spectral reflectance or
transmittance. This data can also be used to calculate the CIE
chromaticity coordinates of the measured object by choosing
from standard sources A, E, D65 (stored in the LI-1800’s software)
or a user-entered standard.
Typical applications for the 1800-12S include leaf reflectance,
transmittance and absorptance in crop canopy studies; color
measurements and quality control of surface coatings, fabrics,
paper, and textiles. Other materials exhibiting marked directional
reflection differences due to surface texture can also be measured.
Integrating sphere geometry of the 1800-12S minimizes
the effects surface texture can have on the type of geometry used
in the measurement.
1800-06 Telescope/Microscope Receptor: Remote measurements
of spectral radiance, irradiance, luminance, illuminance,
reflectance, or color measurements are all possible using the
1800-06 Telescope-Microscope Receptor.
The 1800-06 consists of a receptor body to which a number of
optional lens accessories can be attached. A wide selection of
objective lenses and three field of view (FOV) apertures offer
flexibility in collecting radiant power from submillimeter objects
at close range, to large subjects at great distances. 35 mm
camera lenses can also be used for added flexibility.
The 1800-06 body has an internal reflex viewing mirror that
permits accurate, parallax-free viewing of the object to be
measured. A six position aperture wheel provides apertures
defining 3 different fields of view (for each lens option), a focusing
screen, a diffuser for viewing highly polarized sources, and a
dark position for checking the dark signal level.
1. 1800-06 Receptor Body
2. 1800-06B 3 Degree FOV Lens
3. 1800-12S External Integrating Sphere
The standard lens mount for the 1800-06 is a lockable sliding
tube which is used to mount and focus the optional lenses. The
standard lens mount can also be replaced by the optional 1800-
06D 35 mm camera lens mount (accepts Canon lenses with
bayonet type mounts).
Two telescopic lens options are available for the 1800-06; the
1800-06A 15 Degree FOV Accessory and the 1800-06B 3
Degree FOV Accessory. These options use quartz optics which
have good radiation transmission characteristics from 310-1100
nm. Both options A and B include an extension tube which
allows closer focusing.
Two lens options are also available for microscopic measurements.
The 1800-06C is a microscope lens mount which accepts
standard American Microscope Objects (AMO). Two objectives
are available from LI-COR, the 1800-06E (7x objective) and the
1800-06F (18x objective). Although any standard AMO objective
will mount to the 1800-06, field diameters of at least 0.8
mm are recommended if you wish to maintain full sensitivity of
the 1800-06.
The second microscope option is the quartz microscope which
uses components from the 1800-06A and 1800-06B telescopic
options to form a quartz microscope lens.
21