LI-COR LI-190SA Instruction Manual Download Page 2

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LI-COR Terrestrial Radiation

Sensors, Type SA

Instruction Manual

Publication No. 8609-56 November, 1986

Revised July, 1991

LI-COR, inc.

4421 Superior Street

P.O. Box 4425

Lincoln, NE 68504 USA

Telephone: 402-467-3576

FAX: 402-467-2819

Toll-free 1-800-447-3576 (U.S. & Canada)

Summary of Contents for LI-190SA

Page 1: ...LI COR Radiation Sensors Instruction Manual Terrestrial Type SA LI 190SA Quantum Sensor LI 200SA Pyranometer Sensor LI 210SA Photometric Sensor LI 191SA Line Quantum Sensor ...

Page 2: ...ction Manual Publication No 8609 56 November 1986 Revised July 1991 LI COR inc 4421 Superior Street P O Box 4425 Lincoln NE 68504 USA Telephone 402 467 3576 FAX 402 467 2819 Toll free 1 800 447 3576 U S Canada Copyright 1986 LI COR Lincoln Nebraska USA ...

Page 3: ... Pyranometer Sensor etc NOTICE The information contained in this document is subject to change without notice LI COR MAKES NO WARRANTY OF ANY KIND WITH REGARD TO THIS MATERIAL INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE LI COR shall not be liable for errors contained herein or for incidental or consequential damages in connection with...

Page 4: ...tum Sensor Use of the Quantum Sensor 10 LI 190SA Spectral Response 10 Calibration 12 LI 190SA Specifications 13 Section 3 LI 200SA Pyranometer Sensor Use of the Pyranometer Sensor 14 LI 200SA Spectral Response 15 Calibration 15 LI 200SA Specifications 17 Section 4 LI 210SA Photometric Sensor Use of the Photometric Sensor 18 Photometric Terms 19 Spectral Response 20 Calibration 20 LI 200SA Specific...

Page 5: ...ppendix References 26 Accessories 26 Warranty 27 List of Figures Figure 1 SA type sensors 5 Figure 2 Lambert s cosine law 8 Figure 3 Cosine response of terrestrial sensors 9 Figure 4 LI 190SA spectral response curve 11 Figure 5 LI 200SA spectral response curve 16 Figure 6 LI 210SA spectral response curve 18 Figure 7 LI 191SA cosine response 24 List of Tables Table 1 Millivolt adapters for SA type ...

Page 6: ...sensor The SA type underwater sensors include the LI 192SA Underwater Quantum Sensor and the LI 193SA Underwater Quantum Sensor Figure 1 SA type sensors are terminated with only a BNC connector on the end of the coaxial cable Sensor Recalibration Recalibration of LI COR radiation sensors is recommended every two years Sensors may be returned to LI COR for recalibration or recalibrated using the LI...

Page 7: ...ormation on configuring the LI 1000 please consult the LI 1000 Instruction manual To use a type SA sensor with LI COR light meters such as the LI 185B LI 188B or LI 1776 a factory installed calibration connector is required Other LI COR light meters and integrators including the LI 170 LI 185 LI 185A LI 188 LI 510 and LI 550 require the use of the 9901 014 connector conversion cable Contact LI COR...

Page 8: ...BNC connector and millivolt adapter are not weatherproof If the millivolt adapter is attached to the sensor for connection to a data logger or millivolt recorder this connection should be made at the recorder end indoors This eliminates thermocouple effects caused by exposing the BNC connector and millivolt adapter to rapidly changing direct solar radiation These effects are not noticeable when th...

Page 9: ...ux lines impinging upon a surface normal to the source Figure 2A and at an angle of 60 from normal Figure 2B Figure 2A shows 6 rays striking the unit area but at a 60 angle only 3 rays strike the same unit area This is illustrated mathematically as S I cosine 60 per unit area 3 6 0 5 per unit area where S vertical component of solar radiation I solar radiation impinging perpendicular to a surface ...

Page 10: ...I COR light sensors The acrylic material used in LI COR light sensors can be crazed by exposure to alcohol or organic solvents which will adversely affect the cosine response of the sensor Clean the sensor only with water and or a mild detergent such as dishwashing soap LI COR has found that vinegar can also be used to remove hard water deposits from the diffusor element if necessary ...

Page 11: ...within plant canopies greenhouses controlled environment chambers confined laboratory conditions or at remote environmental monitoring sites are all typical applications for this sensor The LI 190SA can be hand held or mounted at any required angle In its most frequent application the quantum sensor is set on a level surface free from any obstruction to direct or diffuse radiation The sensor may b...

Page 12: ...determine the monochromator output in energy flux density W λ at the wavelength setting λ If Q λ is the sensor output at wavelength λ when exposed to the monochromator output W λ then Q λ can be approximated by Q λ R λ W λ where R λ is the sensor spectral response at the wavelength setting λ The above approximation assumes that the monochromator bandwidth λ is much less than the wavelength setting...

Page 13: ...mp The uncertainty of the calibration is 5 The lamp used in LI COR s calibration is a high intensity standard of spectral irradiance G E 1000 watt type DXW quartz halogen supplied with a spectral irradiance table The following procedure was used to calculate the quantum flux output from the lamp The lamp flux density E in watts m 2 in an increment at a wavelength can be expressed as E E λ λ where ...

Page 14: ...ture Dependence 0 15 per C maximum Cosine Correction Cosine corrected up to 80 angle of incidence Azimuth 1 error over 360 at a 45 elevation Tilt No error induced from orientation Detector High stability silicon photovoltaic detector blue enhanced Sensor Housing Weatherproof anodized aluminum case with acrylic diffuser and stainless steel hardware Size 2 38 Dia x 2 54 cm H 0 94 x 1 0 Weight 28 g 1...

Page 15: ...deal equal spectral response from 280 2800 nm but does not cause serious error provided the photodiode is used only for solar radiation and not under conditions of altered spectral distribution IMPORTANT For this reason we do not recommend its use under artificial lighting within plant canopies or to measure reflected radiation The LI COR pyranometer may be handheld or mounted at any required angl...

Page 16: ...y has an insignificant effect on daily integrations The area under the spectral irradiance curve of the source is directly proportional to the energy received by a horizontal surface Under specific but typical conditions energy received on a completely overcast day has been estimated to be 11 3 of that received on a clear day When both spectral distributions are weighted according to a typical res...

Page 17: ...16 Figure 5 LI 200SA Spectral Response Curve ...

Page 18: ...ime 10 µs Temperature Dependence 0 15 per C maximum Cosine Correction Cosine corrected up to 80 angle of incidence Azimuth 1 error over 360 at 45 elevation Tilt No error induced from orientation Detector High stability silicon photovoltaic detector blue enhanced Sensor Housing Weatherproof anodized aluminum case with acrylic diffuser and stainless steel hardware Size 2 38 Dia x 2 54 cm H 0 94 x 1 ...

Page 19: ... sensor may be handheld or mounted at any angle In its most frequent application the sensor is set on a level surface It is most conveniently leveled by using the 2003S Mounting and Leveling Fixture Keep the sensor clean and treat it as a scientific instrument in order to maintain the accuracy of its calibration The vertical edge of the diffuser must be kept clean in order to maintain appropriate ...

Page 20: ...he theoretical standard C I E observer Measurements are made by visual comparison or by some equivalent photoelectric method Units standards and systems of measurement have been developed to correspond to the effect as observed by the eye Luminous intensity or candle power is a measure of a light source which describes its luminous flux per unit solid angle in a particular direction For many years...

Page 21: ...length and dλ is a differential of wavelength Illuminance is the density of luminous flux incident on a surface A common unit of illuminance is the lux which is the illumination produced by one lumen uniformly distributed over an area of one square meter It follows that a source of one candela produces an illuminance of one lux at a distance of one meter A footcandle is one candela at a distance o...

Page 22: ...nts taken with LI COR sensors calibrated after the above date will give illuminance values of 0 4 higher than would be obtained with the sensors calibrated at the old standards LI 210SA Specifications Absolute Calibration 5 traceable to NBS Sensitivity Typically 20 µA per 100 klux Linearity Maximum deviation of 1 up to 100 klux Stability 2 change over a 1 year period Response Time 10 µs Temperatur...

Page 23: ...ly averages radiation over its 1 meter length minimizes the error and allows one person to easily make many measurements in a short period of time The sensor can also be used for permanent monitoring of radiation within the crop canopy The sensor is fully weatherproof except the BNC connector and can be left unattended Normal use by a single user when measuring radiation within a crop canopy is do...

Page 24: ...ated completely for true cosine response Figure 7 shows the approximate cosine error for collimated light at angles of incidence from 0 normal to 90 Under conditions of partial or full diffuse radiation the errors will generally be negligible Since the sensing area is a flat acrylic diffuser the response at a given angle of incidence is fairly constant as the azimuth angle around the sensor is var...

Page 25: ...ty of the calibration is 10 due primarily to basic calibration limitations and a transfer error when calibrating the LI 191SA against a reference quantum sensor in a spatially uniform light beam This method is due to the large physical size of the LI 191SA Calibration of the reference quantum sensor is performed on a specially equipped optical bench containing a high intensity quartz halogen lamp ...

Page 26: ... Response Time 10 µs Temperature Dependence 0 15 per C maximum Cosine Correction Acrylic diffuser Azimuth 2 error over 360 at 45 elevation Sensitivity Variation over Length 7 maximum using a 1 wide beam from an incandescent light source Sensing Area 1 meter L x 12 7 mm W 39 4 x 0 50 Detector High stability silicon photovoltaic detector blue enhanced Sensor Housing Weatherproof anodized aluminum ca...

Page 27: ...inum with stainless steel leveling screws and a weatherproof spirit level for leveling the sensors during operation 2222SB Extension Cable For use with LI COR terrestrial sensors Standard length is 50 ft 15 2 m or 100 ft 30 4 m Custom lengths up to 1000 ft 304 m may be ordered 1800 02 Optical Radiation Calibrator The 1800 02 is a self contained optical radiation calibrator for on site spectral irr...

Page 28: ...ys after LI COR inc has received written notice of the defect Unless other arrangements have been made in writing transportation to LI COR inc by air unless otherwise authorized by LI COR inc is at customer expense 5 No charge repair parts may be sent at LI COR inc s sole discretion to the purchaser for installation by purchaser 6 LI COR inc s liability is limited to repair or replace any part of ...

Page 29: ...te of shipment to LI COR inc s authorized distributor whichever is earlier This warranty supersedes all warranties for products purchased prior to June 1 1984 unless this warranty is later superseded DISTRIBUTOR or the DISTRIBUTOR s customers may ship the instruments directly to LI COR if they are unable to repair the instrument themselves even though the DISTRIBUTOR has been approved for making s...

Page 30: ... 4421 Superior Street P O Box 4425 Lincoln Nebraska 68504 USA Phone 402 467 3576 FAX 402 467 2819 Toll free 1 800 447 3576 U S Canada E mail envsales env licor com Internet http www licor com ...

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