18 September 2017

Meet Danny and His Aquarium Blog Danny "Daniel and the Lights Den" Larsen

Meet Apogee's newest addition to the marketing team Danny Larsen. Danny started at Apogee this spring helping with international business and technical support. He is also an aquarium hobbyist and is excited to set up an aquarium at Apogee Instruments headquarters. Danny is looking forward to learning more about using our sensors to setup and maintain an aquarium and will be using the aquarium to test Apogee's quantum sensors. You can follow Danny's blog Danny "Daniel and the Lights Den" Larsen for updates on the aquarium and his ocean adventures.

Danny Larsen Bio
I graduated from one of the best schools in the world, Utah State University. I graduated with a degree in International Business from the Jon M. Huntsman School of Business. I always loved business, and had the opportunity there to travel around Asia. I found out about Apogee, and I had to join them as their International Business and Technical Support Specialist. Apogee sells sensors that help the environment and sensors for measuring the light that keeps plants and corals alive.

Tanks being used to test Apogee quantum sensors.

Apogee's first saltwater tank.

I come from a second generation of diving. My mom being the first to start diving. There I learned a love for the ocean. Living in Utah, there aren’t a lot of options for diving, so I’ve done a lot of traveling. I’ve been able to dive with manta rays, icebergs, Great White Sharks, and see a geothermal chimney teaming with life. 

Wife mad at me for a fish giving me a smooch.

I can’t wait to get my kids diving. As the saying goes, a family that dives together, thrives together.

Son wanting to play with daddy after a dive.

Coolest diving in the world, plus iceberg ice is the only way to cool down your Mountain Dew.

After time, the call of the ocean becomes strong. That’s why I started my first aquarium in 2010. I used a sea anemone that told me where the good light and current was at and would put my other corals. Apogee takes the guess work out of where the best lighting for the corals is at. It made my life a lot better, and was able to maintain beautiful aquariums.

Found the Titanic, or the Saganaga, in Newfoundland, Canada.

Diving with a Great White Shark.

When I’m not diving, working for the best company in the world, or tinkering with the aquariums, I love to bike, rock climb, and hike. I’m also a fan of fantasy novels, and have a husky and chameleon at home, and think the only way of roasting marshmallows is over lava. 

It really is the best way to roast a marshmallow, how would a steak taste?

30 August 2017

Quantifying the Great American Solar Eclipse 2017

During the Great American Solar Eclipse of 2017, Dr. Bruce Bugbee, president of Apogee Instruments and a professor at Utah State University, deployed a suite of sensors in the path of totality in Rexburg, Idaho to measure various environmental parameters during the eclipse. In this video, Bruce discusses his findings. The Apogee sensors he used included spectroradiometers, a net radiometer, pyranometers, full-spectrum quantum sensors, infrared radiometers, and a precision thermistor inside an aspirated radiation shield.

Download the slides from the video here >.

20 August 2017

Apogee Spectroradiometer shows eclipse glasses have about 100 times greater filtration than typical sunglasses

Apogee Quantifies the Solar Eclipse

Apogee will be on site quantifying the Great American Solar Eclipse from the center of the path of totality on August 21, 2017. As one of the biggest solar radiation events of the century, Dr. Bruce Bugbee and NYU Professor, Dr. Tyler Volk, will be manning a full suite of Apogee radiation sensors including spectroradiometers, a net radiometer, pyranometers, quantum sensors, infrared radiometers, and a precision thermistor inside an aspirated radiation shield while in Rexburg, Idaho. Stay tuned for a full report and video of their results.

Dr Bruce Bugbee, Schuyler Smith, and Damon Nitzel preparing the Apogee sensors for monitoring the eclipse. Dr Bugbee will be taking the station to Rexburg, Idaho to make measurements from within the total coverage zone.

Dr Bruce Bugbee, Schuyler Smith, and Damon Nitzel preparing the Apogee sensors for monitoring the eclipse. Dr Bugbee will be taking the station to Rexburg, Idaho to make measurements from within the total coverage zone.

Damon Nitzel preparing Apogee sensors for monitoring the eclipse. Dr. Bugbee will be taking the station to Rexburg, Idaho to make measurements from within the total coverage zone.

19 July 2017

Introducing secondary standard, first class, and second class pyranometer calibration services from Apogee Instruments.

In addition to recalibrating quantum sensors and silicon-cell pyranometers from other companies, we now offer indoor thermopile pyranometer calibration services. Calibration complies with the ISO 9847 type llc calibration procedure and includes a calibration certificate showing the procedure, traceability, and calibration factor. (View example calibration certificate >)

Complies with ISO 9847
Calibration method is performed by our highly trained technicians and complies with type IIC of the international standard ISO 9847.

Models We Calibrate
-Kipp and Zonen models: CM 11, 21 and CMP 10, 11, 21
-Hukseflux models: SR 20 and SR 11
-Ask about additional models

Competitive Pricing
Apogee Thermopile Pyranometers   $50 + shipping
Other Companies' Thermopile Pyranometers   $195 + shipping

Repairs and Maintenance
Apogee can complete other repairs and maintenance. Call for details.

Click here for information on how to get your sensor calibrated >

11 July 2017

Apogee Visits Asia

In June, key representatives from Apogee paid a long-overdue visit to a few of our partners in China, South Korea, and Japan. Apogee has a long history of selling sensors in Asia, and we were excited to visit our representatives for the first time in their homeland. Dr. Bruce Bugbee, Mark Blonquist, and Devin Overly soon discovered that we should’ve visited a long time ago, as our partners gave great insights and showed wonderful hospitality.

In China, they visited Campbell Scientific Beijing, Beijing Techno Solutions, Channel Technology, Dianjiang Technology, and Truwel Scientific in a series of very productive training and strategy sessions. From the visit, they learned that Apogee’s infrared radiometers are particularly popular in China for use on flux towers.

Campbell Scientific Beijing

Beijing Techno Solutions

Channel Technology

Dianjiang Technology

Truwel Scientific

In South Korea, the team visited B & P International, Sentrol Systems, and TMI. They were impressed with what they learned, and discovered Apogee’s pyranometers are strong sellers in South Korea due to the country’s strategic adoption of renewable technologies like solar power.

B & P International

Sentrol Systems


The last leg of the trip was to Tokyo, Japan, where the team met with Fujiwara, Climatec, Senecom, and EKO. They were treated extremely well and learned many things about the Japanese market. In particular, Apogee’s quantum sensors are very popular in Japan due to the advanced level of research in horticulture and agriculture.

Fjuiwara and Climatec


Although the trip was busy and involved a lot of travel, the effort was well worth it, as new friendships were made, partnerships solidified, and new ideas and strategies were exchanged. As a company, we hope to visit our friends in Asia many more times in the future.

10 April 2017

How to Choose the Right Oxygen Sensor

Not sure which oxygen sensor you need for your application? In this video, Schuyler Smith of Apogee Instruments, covers the different oxygen sensor models we offer, applications they are best suited for, and which accessories are needed for those applications.


07 March 2017

Weather Information Service Engine Project (WISE)

Weather Information Service Engine Project (WISE) is dedicated to resolve urban environmental issues including high-resolution weather forecasting, urban flooding prediction, road meteorology and urban carbon dynamics, and new urban service systems to minimize and mitigate the impacts of natural disasters and climate change on urban dwellers. WISE is targeting South Korea’s capitol, the megacity Seoul, and surrounding urban areas. Recently they started a project called the City Energy Monitoring System, focused on researching greenhouse gas emission from cars, buildings, and the people in Seoul City. As part of the project they are trying to analyze how concrete buildings, houses, and asphalt roads in the city interact with nature, such as rivers and parks that are in and surround the city.

Weather station installed by B&P International for WISE project featuring Apogee SP-111 Infrared Radiometer

One of seven weather stations installed by B&P international for WISE project City Energy Monitoring System.

To fill this study B&P International installed seven weather stations throughout Seoul city. Six of the weather stations were installed on building roof tops, while the final station was installed in a rural area near Seoul. The stations are being used to monitor air temperature, humidity, wind, net radiation, CO2/H2O concentration etc. as well as building surface temperature. Building surface temperature is being measured with Apogee SI-111 Infrared Radiometers, temperature probes, and infra-red cameras.

AApogee Instruments SI-111 Infrared Radiometer monitors building surface temperature for WISE project

SI-111 Infrared Radiometer monitors building surface temperature.

Data collected from the temperature probe and the SI-111 at the same site are being compared and analyzed. The SI-111 is being used as the standard for accuracy, as measurements from the temperature probe may be heated by solar radiation. As the data is collected, it is transmitted to a computer at the WISE office using 4G LTE modems. From there the data is uploaded to the WISE website, where it can be viewed in real time for analysis.

More information on WISE >

Application Summary

SI-111 Infrared Radiometers measure building surface temperature as part of Weather Information Service Engine (WISE) Project.

Apogee Sensors Used
SI-111 Infrared Radiometer

Weather Information Service Engine Project (WISE)

B&P International Co. Ltd.

Seoul, Korea

27 February 2017

Monitoring PV Panels on Jin Jeop Library

Two Apogee Instruments SP-110 Silicon-cell Pyranometers have been integrated by Daeyeon CNI as part of a PV monitoring system at the Jin Jeop library located in Namyangju city, Gyunggido, Korea. The library has a PV power generation facility on the roof of the building that is converting DC voltage to AC voltage and suppling power to the building for electric lamps, air conditioning, and water heaters.

Apogee Instruments Silicon-cell Pyranometers monitor PV Panels at Jin Jeop Library in Korea

Jin Jeop Library in Namyangju City, Gyunggido, Korea

The two SP-110 pyranometers are mounted to the side of the PV panels. One pyranometer is mounted horizontal to measure the global solar irradiance, and the other is mounted tilted in the plane-of-array to measure global tilted irradiance or plane-of-array irradiance. Although the pyranometer measuring plane-of-array irradiance is mounted at the same angle as the PV panels and is measuring the irradiance the panels are receiving, both pyranometers are being used to monitor the system.

Apogee Instruments Silicon-cell Pyranometers monitor PV Panels at Jin Jeop Library in Korea

Top pyranometer is measuring plane-of-array irradiance. Bottom pyranometer is measuring global horizontal irradiance.

The data from the SP-110 sensors allow the integrator to see when irradiance measurements for the PV panels are below the accepted threshold to maintain the PV system. They are then able to use the data from the pyranometers and other instruments that are providing panel temperature, current, and voltage data to investigate the system and fix or replace bad electronic parts and PV panels.

Apogee Instruments Silicon-cell Pyranometers monitor PV Panels at Jin Jeop Library in Korea

Apogee Instruments SP-110 Silicon-cell Pyranometers collect global horizontal irradiance and plane-of-array data to monitor the PV system at Jin Jeop Library in Korea.

Application Summary

SP-110 Silicon-cell Pyranometers are integrated as part of a PV monitoring system for a PV power generation facility on the roof of the Jin Jeop library in Gyunggido, Korea.

Apogee Sensors Used
SP-110 Silicon-cell Pyranometers

Daeyeon CNI
B&P International Co. Ltd.

Namyangju City, Gyunggido, Korea

01 February 2017

High Throughput Field Phenotyping Multi-sensor System

Apogee Instruments' SI-131 Infrared Radiometer (referred to in reference as thermal infrared radiometer, TIR) was selected to be part of a multi-sensor high throughput field phenotyping system for soybean and wheat breeding. The infrared radiometer was used to collect canopy temperature, one of six crop canopy sensor based traits being studied. Temperature, along with the remaining five sensor based traits: canopy height, two NDVI indices, reflectance, and RGB were studied to find a correlation with final yield.

Field phenotyping system platform feature Apogee Instruments' infrared radiometer

Field phenotyping system platform featuring Apogee Instruments' infrared radiometer.

The system consisted of a manually operated platform using a laptop with a special developed LabVIEW program as a controlling unit to collect, synchronize, and store measurements from all sensors for analysis. Apogee's SI-131 was mounted to a sensor bar on the platform at a distance that allowed for a representative subarea of the crop canopy to be seen in the sensor's field of view. The analog infrared radiometer was connected to the laptop through a USB data acquisition board. The LabVIEW program read the infrared radiometer outputs from the analog input ports and applied Apogee's calibration equation to convert the sensor voltage to degrees Celsius. Yufeng Ge, a Biological Systems Engineer from the study said, "The infrared radiometer by Apogee Instruments is among one of the most reliable and trustworthy sensors I have used."

Field phenotyping system platform feature Apogee Instruments' infrared radiometer

Sensors that were mounted to the sensor bar of the platform.

The system was successfully tested over 240 plots of wheat and 120 plots of soybean crop using a manual stop-measure-go data collection method.* The study determined that final grain yield of soybean is strongly correlated with all six sensor base traits, and suggested the usefulness of the sensor system in plant breeding.

Read the Full Article >

*A stop-measure-go data collection method was used because slow response times from sensors did not allow for continuous measurement (the SI-131 with a response time of 0.6 seconds was noted as one of these sensors in the reference article). Since this study took place Apogee has developed  high speed, analog infrared radiometers with a response time of 0.2 seconds and SDI-12 infrared radiometers...more information >

Application Summary

Apogee Instruments' infrared radiometer is used to measure canopy temperature on a multi-sensor system for high throughput field phenotyping in soybean and wheat breeding.

Apogee Sensors Used
SI-131 Infrared Radiometer

University of Nebraska-Lincoln

Lincoln, Nebraska

Reference Article
A multi-sensor system for high throughput field phenotyping in soybean and wheat breeding

"The Infrared Radiometer by Apogee is among one of the most reliable and trustworthy sensors I have used."
-Yufeng Ge
  Biological Systems Engineer
 University of Nebraska-Lincoln

18 January 2017

Reflectance Measurements in Cotton Fields

Dr. Glen Ritchie of the University of Georgia has used model PS-100 spectroradiometer to take reflectance measurements in cotton fields and estimate defoliation. Chlorophyll gives plant leaves a reflectance spectrum characteristically different from that of soil. Reflectance measurements can be reported in µmol m-2 s-1, W m-2, or as a relative value.

View poster presented at ASA meeting.

Spectroradiometer used for reflectance measurement

Application Summary

Estimating defoliation of cotton using reflectance data.

Sensors Used
PS-100 Spectroradiometer

University of Georgia


Original Article
Ritchie, G.L. and C.W. Bednarz. 2005. Estimating defoliation of two distinct cotton types using reflectance data. J. Cotton Sci. 9:182-188.

Poster from ASA meeting 2006

12 January 2017

Irrigation Study

Dr. Joan Girona of the Institute of Agroalimentary Research and Technology in Catalonia, Spain, is studying irrigation and the water and nutrient needs of fruit trees.

He needed to capture pyranometer readings throughout his orchard. Dr. Girona mounted Apogee pyranometer sensors and Campbell Scientific dataloggers on a carefully laid out model train track around the orchard. The train carrying the pyranometer sensors and dataloggers wound around the track and could take measurements at specified intervals. Dr. Girona could then take thousands of measurements. His system was so effective he plans to continue running it for more experiments in the future.

Learn more about Dr. Girona’s experiment by reading the original article on Campbell Scientifics’ website.

Apogee silicon-cell pyranometer used in irrigation study

Application Summary

Pyranometer mounted on model train to collect measurements in orchard for irrigation study.

Sensors Used
Silicon-cell Pyranometer

Institute of Agroalimentary Research and Technology

Catalonia, Spain

Original Article
Spain: Irrigation and Solar Radiation - Campbell Scientific

06 January 2017

Controlling Flowering of Orchids in Greenhouse

Dr. Erik Runkle of Michigan State University used the SQ-313 line quantum sensor mounted on a cross bar (as shown below) in greenhouse experiments controlling the flowering of Phalaenopsis Orchids. In the experiment the SQ-313 was used to measure photosynthetic photon flux and the daily light integral at plant height for both natural and electric light sources, while temperature was experimented with to control flowering.

For the complete journal article of the experiment, click here.

Apogee line quantum used in greenhouse

Application Summary

Line quantum used to measure PPFD and daily light integral, while experimenting with temperature to control flowering of Phalaenopsis Orchids.

Sensors Used
SQ-313 Line Quantum Sensor

Michigan State University

Lansing, MI

Original Article
Temperature during the day, but not during the night, controls flowering of Phalaenopsis Orchids