Portable Optical Densitometer

From:Linshang Time:2020/05/13 17:30:00 Browse:152
The optical densitometer (transmission densitometer) is mainly used to detect the optical density value of various materials such as X-ray film, aluminized film, etc.

Optical densitometer (transmission densitometer) can be used to detect the optical density value (also called OD value) of various materials such as X-ray film, aluminum coating, infrared ink, film and other materials. This article will introduce you a popular portable optical densitometer-LS117 optical densitometer (optical densitometer).

I.What do you mean by optical density?

1. Optical Density Definition

Translation reference: Optical density is a term used in the field of optical spectroscopy to describe the shading ability of materials. The optical density value is calculated as the logarithmic ratio of the radiation incident on the material to the radiation transmitted by the material.
Optical density formula: OD = lg (the radiation incident on the material / radiation transmitted by the material) or OD = lg (1 / transmittance)

2. Why is optical density important?

In general, when testing some materials that look opaque but actually have a lower light transmission capacity, it is difficult to compare the difference in light transmittance between materials with the light transmittance value. The visible light transmittance can be converted into optical density value data to compare with the standard value. The professional optical densitometer can be used to detect the optical density value.

II.Best portable optical densitometer

1. Optical densitometer details

Optical densitometer is a professional tester for detecting the optical density (OD) value of materials. The optical densitometer is widely used and is suitable for the measurement of light transmittance and optical density of various light-transmitting materials (including various transparent materials, frosted, opalescent, misty and other translucent materials), such as X-ray film, aluminum coating, infrared Ink, mobile phone cover, frosted glass, lampshade and so on.

Linshang optical densitometer
Linshang optical densitometer

2. The most popular portable optical densitometer

At present, the most common densitometer brands are X-rite densitometer and Linshang LS117 optical density meter. As a professional optical densitometer manufacturer, Linshang Technology has independently developed an LS117 optical densitometer that has been popular since its introduction. In addition to measuring the optical density value of materials, it can also measure the transmittance value.

Adopt diffuse transmission principle, test aperture is 2mm
The light source adopts 380-760nm white light that meets the CIE photopic luminosity standard
Suitable for measuring the optical density of X-ray film, aluminized film and various films
It is suitable for measuring the light transmittance of various light-transmitting materials such as transparent, opalescent, fog, frosted,etc.
Price: $550
Model: LS117
Parameters LS117 portable optical densitometer
Optical density range 0.000OD-6.000OD
Optical density accuracy ± 0.02 (0-2.00OD),
± 2% (2.00-6.00OD)
Optical density resolution 0.001 OD (0.00-2.00OD),
0.01 OD (2.00-4.00OD),
0.1 OD (4.00-6.00OD)
Transmittance range 0-100%
Transmittance accuracy ± 1% (0% -50%),
± 2% (50% -100%)
Transmittance resolution 0.0005% (0% -10%),
0.005% (10% -100%)

3. LS117 optical densitometer operation 

III.FAQ of Optical densitometer

  1. 1. How do you calibrate optical densitometer?

    Some brands of optical densitometers will be equipped with standard films for the calibration of the instrument, but aging and oxidation will also occur when the standard films are placed for a long time. The visible light transmittance and optical density values will change. Using such standard films to calibrate the instrument will result in inaccurate data. The Linshang LS117 optical densitometer has an automatic calibration function. As long as it can pass self-calibration after startup, it can ensure the accuracy of the test data. If you can’t pass the self-calibration after powering on, you need to contact the optical densitometer manufacturer for technical support.

  2. 2. How to convert optical density to transmission?

    Optical density is the logarithm of the reciprocal of the material light transmittance, that is, OD = lg (1 / transmittance). The formula looks very complicated, but in fact there is no need for calculation when use LS117 optical densitometer. The instrument can directly display the optical density value and transmittance value.

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