Home GADGETS The Differences Between Trigonometric And Diffuse Reflection Sensors

The Differences Between Trigonometric And Diffuse Reflection Sensors

Panasonic focuses on the differences between diffuse direct reflection and trigonometric sensors. The basic theory of direct reflective sensors is to decide which type is best suited for each application.

Conventional Diffuse Reflection

In a conventional scattered light sensor, an operation is quite simple. A beam of light is emitted (typically red or infrared). This bounces off the present object and depending on the amount of reflected light (the one that returns to the sensor), the output is activated or not. If there is no object or the object is far away, there will not be enough light returned, and the work will not be activated. This is how most direct reflective sensors work. However, objects of different colors can create some difficulties: a white (or light) thing reflects more light than a black (or dark) one, and this implies that the light one may be detected, and probably the dark one will not.

It is also necessary to consider the impact of varying the distance. The same object will reflect more light the closer it is. An example of the implication of all this: a black box near the sensor can give the exact reflection as a much more distant white one. The sensor only evaluates the amount of light that returns, and in this case, the amount is the same. From what has been said, it is easy to understand that there can be difficulties detecting objects when the background is lighter than the object to be seen.

Trigonometric Reflection

In this case, the principle of operation is different. Also, in this case, a beam of light is emitted, but the quantity of reflected light is not considered, but “where” it is reflected. The photocells have a photodiode located behind a focusing lens and offset relative to the emitting diode. With pure trigonometry, depending on the distance from the object, the lens will concentrate the reflected beam at different points of the photodiode. Therefore, we will be able to discriminate by length instead of by quantity of light. With the following image, it will undoubtedly be more apparent.

With these sensors, there will no longer be the problem of confusing a light background with a dark object. This is why these photocells are called background suppressors. Is one type of sensor better than another? Not necessarily. This will depend on the application to be solved. Let’s take a look at a couple of examples.

Detect Objects Regardless Of Color

In this case, a diffuse detection sensor is not suitable because the adjustment we can make for a specific color may not be valid for detecting an object of another color. Here a trigonometric sensor will undoubtedly be cheaper. Same thing if the bottom is very close

Detection Of The Label Placed On An Object

In this case, if the label is white or lighter than the product to which it is attached, we should choose to discriminate with a diffuse light sensor based on the amount of reflected light since the difference in distance, which is the thickness of the label, is minimal. As you can easily see, depending on the application, one option or the other suits us better. For this reason, it is essential to know how each technology works to decide by evaluating which criteria are the most appropriate. In the following video, some tests were performed with sensors of both types to see the differences. In particular, the #NoSpace miniature photocell CX412 was chosen as the diffuse reflection sensor, while the CX442 photocell was selected as the trigonometric sensor.

Also Read: Digital Writing: How To Write On The Web

Tech Cults
Tech Cults is a global technology news platform that provides the trending updates related to the upcoming technology trends, latest business strategies, trending gadgets in the market, latest marketing strategies, telecom sectors, and many other categories.

RECENT POSTS

eBPF: The Next Generation Of Instrumentation For Kubernetes

The development and delivery of software has altered in the cloud-native age. Understanding your application's behavior across multiple tiers of the stack can be...

Unlocking Value: How To Maximize Profits by Selling Used Laptops

Selling your used laptop is a great way to get some cash back on an old computer. But it can also be tricky if...

Experience Marketing: Creating Emotional Connections With Consumers

In the increasingly competitive world of business, companies are looking for ways to stand out and gain consumer loyalty, and it is in this...

Japanese Translation Picture – Best Online Tool To Translate Text From Picture

In today's interconnected world, communication across language barriers is becoming more and more important. The capability to translate texts from one language to another...

Types Of PC Processors: Which One To Choose For Companies?

In recent years, the supply of different types of processors for PCs has increased. Knowing how to choose the best option can be a...

Applying Data Version Control For Modern Business Intelligence Systems

In today's fast-paced and data-driven business landscape, companies rely heavily on accurate and timely insights to make informed decisions. Business Intelligence (BI) is a...