The greenhouse film refers to a special plastic film used for the construction of agricultural facilities in the facility. Its light transmittance, heat preservation, tensile strength and aging resistance are superior to ordinary agricultural films. It is of great significance for the growth of crops in greenhouses and the increase of production and income.
According to the material classification, the common greenhouse film can be divided into four types: polyvinyl chloride (PVC) shed film, polyethylene (PE) shed film, ethylene-vinyl acetate copolymer (referred to as EVA) shed film, dimming agricultural film.
The transmittance of greenhouse film made by different materials varies from 80% to 99%. The light transmittance of greenhouse film has a great influence on the growth of plants. Therefore, we need to use a professional spectrum transmission meter to test the light transmittance of the greenhouse film. In addition to the materials used in the greenhouse film, the colors are also diverse.
1.For transparent greenhouse films that only need to test light transmittance, we recommend LS116 spectrum transmission meter with parallel light path design.
The Linshang LS116 spectrum transmission meter uses a white light source of 380 nm-760 nm. The instrument is designed for parallel light and is suitable for testing transparent materials. The light source complies with the CIE photopic luminosity function and is guaranteed to pass the Chinese National Metrology Institute standard.
2.For greenhouse film with color and need to test the infrared and ultraviolet transmittance, we recommend LS183 spectrum transmission meter.
The color of the agricultural film is different and the absorption and reflection effects on sunlight are also different. Therefore, the effects on temperature, pest occurrence conditions and weed growth are also different. The effects on the growth of different crops are quite different. Taking blue agricultural film as an example, the blue agricultural film has good heat preservation performance and the light transmittance is higher than that of the ordinary film under the weak light condition. Lower than the ordinary film under the strong light condition. For crops, there is a clear increase in production and quality.
Linshang LS183 spectrum transmission meter uses parallel light path design and 380nm-760nm white light source, suitable for testing colored glass, solar film, greenhouse film and so on. Compliant with CIE photopic luminosity function. It is a high precision spectrum transmission meter suitable for testing transparent materials. In addition to the requirement for light transmittance, the greenhouse film also has requirements for infrared rejection rate and ultraviolet rejection rate. In addition to testing the light transmittance, the Linshang LS183 spectrum transmission meter can also test the transmittance of infrared 940nm and ultraviolet 365nm. One instrument can meet all customer needs.
3.For translucent greenhouse films, we recommend LS117 spectrum transmission meter which adopt diffuse transmission principle.
Translucent materials generally belong to irregularly transmissive materials and a large portion of the light is scattered after the light passes through the film. Therefore, we recommend a spectrum transmission meter using the diffuse transmission principle. The Linshang LS117 spectrum transmission meter uses the diffuse transmission principle which has an integrating sphere effect. During the test, the screen can display both the transmittance value and the optical density value.The optical density value can be measured to OD6, which is suitable for testing the optical density of materials such as aluminized film, film, X-ray film, lens ink.
For customers who need to test the transmittance of greenhouse film, you can choose the spectrum transmission meter that suits you according to the above introduction.