Order For Similar Custom Papers & Assignment Help Services

Fill the order form details - writing instructions guides, and get your paper done.

Posted: September 29th, 2022

Light signal detector – APD

Light signal detector – APD
An avalanche photodiode uses the avalanche process to provide additional performance and sensitivity. Once the photodiode absorbs photons, the collision of electrons within the semiconductor breaks down the solid structure of atoms freeing up more electrons. This leads to a sudden rapid increase in the electronic current. Furthermore, a high reverse bias condition translates into a greater level of sensitivity for APDs. Charge carriers are pulled away from one another by the high electric field once a photon enters the depletion region and creates a hole electron pair. The process results in high velocity within the departing charge carriers which eventually collide with the atomic lattice creating further hole electron pairs. The process then repeats itself. Meanwhile, a photomultiplier tube, PMT, converts photons into electrons using a photocathode through the photoelectric effect. A photocathode is a negatively charged electrode coated with a photosensitive compound (Polyakov, 2013). When struck by a photon, the absorbed energy causes electron emission.
An avalanche photodiode has a higher level of sensitivity when compared to a photomultiplier tube due to avalanche gain. This allows it to substitute PMTs in low light detection applications. APDs also have significantly higher quantum efficiency and a large measurement range from 300mm to the NIR range. More so, the deep depletion range of the APD eliminates performance degradation witnessed in PMTs. However, avalanche photodiodes produce high levels of noise than the PMT, which delivers low noise and low jitter detection. The PMT also supersedes the APD in terms of linear gain. The avalanche process creates an output that is not linear. In some instances, the APD requires a much higher operating voltage than the PMT. This makes it less convenient to use, especially when coupled up with lower reliability.
References
Polyakov, S. (2013). Photomultiplier Tubes – an overview | ScienceDirect Topics. Retrieved 31 January 2020, from https://www.sciencedirect.com/topics/physics-and-astronomy/photomultiplier-tubes

Order | Check Discount

Paper Writing Help For You!

Special Offer! Get 20-25% Off On your Order!

Why choose us

You Want Quality and That’s What We Deliver

Professional Writers

We assemble our team by selectively choosing highly skilled writers, each boasting specialized knowledge in specific subject areas and a robust background in academic writing

Discounted Prices

Our service is committed to delivering the finest writers at the most competitive rates, ensuring that affordability is balanced with uncompromising quality. Our pricing strategy is designed to be both fair and reasonable, standing out favorably against other writing services in the market.

AI & Plagiarism-Free

Rest assured, you'll never receive a product tainted by plagiarism or AI-generated content. Each paper is research-written by human writers, followed by a rigorous scanning process of the final draft before it's delivered to you, ensuring the content is entirely original and maintaining our unwavering commitment to providing plagiarism-free work.

How it works

When you decide to place an order with Nurscola, here is what happens:

Complete the Order Form

You will complete our order form, filling in all of the fields and giving us as much detail as possible.

Assignment of Writer

We analyze your order and match it with a writer who has the unique qualifications to complete it, and he begins from scratch.

Order in Production and Delivered

You and your writer communicate directly during the process, and, once you receive the final draft, you either approve it or ask for revisions.

Giving us Feedback (and other options)

We want to know how your experience went. You can read other clients’ testimonials too. And among many options, you can choose a favorite writer.