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Help CenterTBQ-5 Type Photosynthetically Active Radiation PAR Sensor Photosynthesis 400-700nm Measurement Crop Growth Sensor for Farming
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I. Product Overview
The portion of solar radiation (with a spectral range of 400–700 nm) that can be utilized by green plants for photosynthesis is defined as Photosynthetically Active Radiation (PAR). As the fundamental energy source for biomass formation, PAR directly affects plant growth, development, yield, and product quality. The measurement of PAR is of great significance for agricultural production, ecological research, climate assessment, and other related fields.
The TBQ-5 Photosynthetically Active Radiation Sensor is a dedicated solar radiation sensor based on the photoelectric effect, designed specifically for measuring the PAR of natural light within the 400–700 nm wavelength range. Featuring simple operation, maintenance-free performance, and high measurement accuracy, it can be directly integrated into agricultural automatic weather stations and solar energy resource observation systems, serving as a fundamental tool for measuring the photosynthetically active component of solar radiation. Additionally, it can be independently used as a professional radiation sensor for agricultural and biological research applications.
II. Working Principle
The TBQ-5 Photosynthetically Active Radiation Sensor is designed and manufactured based on the principle verified by numerous experiments that the five major plant photoreactions—namely photosynthesis, pigment synthesis, photoperiodism, phototropism, and photomorphogenesis—all occur within the wavelength range of 400–700 nm.
It adopts silicon photodetectors and optical filters as its core components. When exposed to light, the sensor generates an analog signal that is directly proportional to the intensity of the incident radiation.
III. Technical Specifications
No. |
Item |
Technical Range |
Remarks |
1. |
Stability |
±2% |
Sensitivity variation within one year |
2 |
Cosine Response |
≤±5% |
Deviation from ideal value at solar altitude of 10° on sunny days |
3 |
Spectral Range |
400～700 nm |
- |
4 |
Temperature Characteristic |
±2% |
-20℃～+40℃ |
5 |
Signal Output |
0～20 mV |
Can also output 4～20 mA or RS485 signals when paired with a transmitter |
6 |
Measuring Range |
A: 0～2500 μmol/m²·s B: 0～2000 W/m² |
- |
7 |
Measurement Accuracy |
＜5% |
- |
8 |
Response Time |
≤3 s |
99% response |
9 |
Power Supply |
No power supply required |
- |
10 |
Weight |
0.5 kg |
- |
11 |
Operating Temperature |
-40～80℃ |
- |
12 |
Operating Humidity |
0～100% RH |
- |
13 |
Protection Rating |
IP65 |
- |
IV. Typical Applications
Full-growth-cycle PAR monitoring for field crops such as wheat, corn, and riceCombine with water and fertilizer management to optimize light use efficiency, reduce resource waste, and improve crop quality.
Light regulation in protected agriculture greenhouses (artificial supplementary lighting / shade net control)Precisely match the light requirements of crops in different growth stages to increase greenhouse yields.
Integration into agricultural IoT systems for smart agriculture applicationsEstablish crop growth models to enable yield prediction, provide data-driven decision support for large-scale cultivation, and reduce market risks.
Support for agricultural scientific researchProvide high-precision PAR data for crop photosynthetic efficiency studies and variety screening trials, facilitating the publication of research papers and advancement of technological innovation.
For more information, please contact me.
Jinzhou Sunshine Meteorological Technology Co., Ltd
Address: No. 15 Donghai Avenue,Jinzhou,Liaoning,China
Sales Manager : Ms. Zhang
Email: Jzyg322@gmail.com
Whatsapp:+86 15841668971
Wechat: 15841668971
Send Inquiry to This Supplier
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