A series of light transmittance testing instruments provided by Linshang Technology include a light transmittance meter LS116 with a parallel light path design, a optical densitometer LS117 with a diffuse transmission principle, and a split type light transmittance meter LS110 that measures the car front windshield. The light sources used in these light transmittance meters comply with the CIE photopic luminosity function.
For more detailed selection and frequently asked questions about the light transmittance meter and optical density meter, please click "Light Transmittance Meter Selection and FAQ" for details.
LS116 Light Transmittance Meter (2nd)
This meter is self-contained light sources and self -calibration
Visible light wavelength: 380nm-760nm ( Full Weighted Spectrum)
With a parallel optical design, visual function compensation
Suitable for glass, film, organic materials and other transparent materials' transmittance detection
LS117 Optical Density Meter (2nd)
1. Use diffuse transmission principle
2. Light source: 380-760nm, conforms to CIE photopic luminosity function
3. With fixed base measurement and handheld measurement two methods
4. Suitable for optical density test of aluminum film,lens ink and other translucent materials and transmittance test of all kinds of materials such as opalescent, matte, etc.
LS110 Light Transmittance Meter
1.Specially used to test the visible light transmittance of the wind shield of the car
2.Visible light wavelength: 380nm-760nm, CIE photopiv luminosity standard
3.Two laser for two part alignment, more accuracy.
4.The built-in lithium rechargeable battery is easy for using without replacing the battery.
LS152 Vacuum Coating Thickness Measuring System
1.Provides dual RS485 communication interface, the standard MODBUS communication protocol,
2. Convenient for communications with PLC, human-machine interface and computer.
3.Can be customized according to customer's demand
How to Choose the Right Light Transmittance Meter?
I. How is light transmittance measured?
Visible light transmittance: Visible transmittance is the amount of light in the visible portion of the spectrum that passes through a glazing material.It describes the percentage of visible light (approximately 390 to 780 nanometers within the solar spectrum) transmitted through the glass. A lot of materials have VLT requirements. (Quoted from Wikipedia) Nowadays, we can get the VLT of the test material by the light transmittance testing instrument. Next, we will introduct three cost effective light transmittance meters. The parameters of these light transmittance meters are listed below:
| Model | LS110 | LS116 | LS117 |
| Light source | 380nm-760nm, conform to CIE photopic luminosity function | ||
| Test parameters | Visible light transmittance (VLT) | visible light |
|
| Principle | Regular transmission | Diffuse transmission | |
| Application |
Car windshield, window and glass |
Glass, PC and other |
Lampshades, zirconia and other opalescent , translucent, frosted materials |
Measurable material |
>40*40mm | Diameter>10mm | Diameter>2mm |
| Accuracy | VLT: ±2% |
VLT: ±1% (Colorless transparent and regular materials) |
VLT: ±1% (0%-50%); ±2% (50%-100%) |
| Resolution | VLT: 0.1% |
VLT: 0.001%(0%-10%) 0.01%(10%-100%) |
VLT: 0.0005% (0%-10%); 0.005% (10% -100%) |
II. The difference between regular transmission and diffuse transmission
1. Regular transmission
The phenomenon that light deflects through a material with a smooth surface and a uniform medium and then deflects at the same angle is called regular transmission.
2. Diffuse transmission
The light passes through a material with a rough surface or an uneven medium, the transmitted light will be scattered in many directions because the light will be refracted at different angles on the rough materials' surface and at the junction of the uneven medium, the phenomenon is called diffuse transmission.
III. Common regular transmission and diffuse transmission materials
Regular transmission needs to meet the two characteristics of uniformity and transparency of the medium. We can determine whether the material is a regular transmission material in a simple way: observe the palm of your hand through the tested material. If you can clearly see the edge of the palm, then the measured material belongs to the regular transmission material; otherwise it belongs to the diffuse transmission material (provided that the light-transmitting material).
1. Regular transmission material
| Flat glass | Insulating glass | Tempered glass |
| Transparent acrylic | Transparent PC | Transparent PET |
| Transparent PETG | Transparent PP | Transparent PMMA |
| Transparent ABS | Transparent PA | Other transparent materials |
Note: The regular transmission materials listed above are for reference only
2. Diffuse transmission materials
| Frosted glass | Opal glass | Embossed glass |
| AG glass | PE Translucent | Dimming glass |
| Translucent PVB | Translucent PP | Translucent PA |
| X-ray Film | Zirconia |
Other materials with a transmittance but non-transparent |
Note: The diffuse transmission materials listed above are for reference only
IV. Can LS117 optical density meter test regular transmission materials?
Yes, the LS117 optical density meter is not only suitable for measuring all kinds of diffuse transmission materials, but also suitable for regular transmission materials. If you have multiple testing needs, it is recommended to choose this model. If you only need to measure uniform and transparent regular materials, the LS116 light transmittance meter is more cost-effective.
V. Whether a traceable calibration certificate is included？
The calibration certificate is not a standard configuration.If you need it, please pay additional calibration costs and wait patiently for the inspection duration of the device.
The three Linshang light transmittance meters conform the relevant regulations and standards, and can pass the inspection of authoritative measurement agency (which has been approved by CNAS and ilac-MRA) and obtain a calibration certificate.
Calibration costs are as follows:
| Model | LS110 and LS116 light transmittance | LS117 | |
| Certificate fees | US$180 |
US$260 (OD and VLT) US$180 (only for VLT) |
|