How to use a Densitometer for black and white Film Density Measurement
So you want to learn about densitometers?
While non-destructive methods of testing have been well adopted as a necessary procedure for quality assessment in most industries, it is, however, not without its challenges.
One major problem is the quality of images used in the analysis and generation of test results. Luckily, a tool like a densitometer helps inspectors and radiographers confirm these images' quality. But how does this tool work? If you are ready to find out, then let's dive in.
What is a densitometer in radiography?
For radiographers, a densitometer implies a tool that helps measure a film's sensitivity when exposed to a light source. It measures the density or level of light absorption by the film. Hence, it is also known as an absorptiometer.
In its simplest form, a densitometer is an illumination source projecting a beam of light onto a material placed between it and a photoelectric cell with an integrated measuring device.
This photoelectric device then determines the amount of light transiting through the material. To put it in another way, it measures the density of the light absorbed by the material.
Densitometers have a wide variety of applications in the manufacturing industry, where they are used to ascertain the properties of certain materials based on the amount of radiation it absorbs. Additionally, densitometers are categorised based on their ability to scan, reflect, and transmit light from a material surface. This helps radiographers compare material thicknesses of different samples and ensure that they meet standard density requirements for films.
What are the features of a densitometer?
Primarily the objective of using a densitometer is to measure light sensitivity and absorption of the material. Consequently, a light source and a photocell are the main features of a densitometer.
Other features include a table with lights - usually LEDs, and settings to control the brightness of the light. Also, there are usually features for making images easy to spot, like high spot luminance.
Additionally, there are automatic calibration features for calibrating the device. But that's not all. The measuring range, standard of calibration, and device accuracy are also featured on the tool. Not forgetting the protection for the probe head.
How do you use a densitometer for black and white film density measurement?
A few steps are required to measure the density of black and white film using a densitometer. Firstly, ensure power is supplied to the densitometer by plugging its cord to the power source and then turning it on.
Next, press the dimmer button to reduce or increase the table light brightness as required. There are usually different settings levels for the table light indicated close to the dimmer control.
You can also long-press the dimmer button to choose between 100% or 50% table light brightness. Next, engage the probe button by pressing it down until it touches the table. Long-press the null switch to reveal 0:00 before releasing the probe button again.
Next, you'll need to reboot the device before starting the measurement. Subsequently, insert your film between the table and the probe button and press the button down on the film and wait for the density reading. Release as soon as density appears on the display screen.
Conclusion
To wrap up, a densitometer is a vital tool for quality control and assessment. However, the reliability of this great tool can be significantly affected by the quality of the supplier you choose.
Fortunately, NDT-KITS, a Chinese manufacturer of quality densitometers with over 35 years of industry experience, has a consistent track record of delivering bespoke NDT solutions to customers' requirements.
They are strategically located in Shenzhen, the Silicon Valley of China, which gives them access to a large pool of experienced professionals and experts in the NDT industry.
This pool of experts ensures their production cost is significantly lower than their American and European counterparts. It also ensures its prices are very competitive with affordable prices for its customers.
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