Essays about: "optical sensors"

Showing result 1 - 5 of 56 essays containing the words optical sensors.

  1. 1. Comparison of Tunnel Convergence Measurement Methods

    University essay from KTH/Fastigheter och byggande

    Author : Olof Erlandsson; [2020]
    Keywords : tunnel; convergence; displacement; tilt; sensor; tunnel; konvergens; förskjutning; tilt; sensor;

    Abstract : When creating cavities below ground, movements occur in the surrounding soil due to disrupted equilibrium. In tunnel constructions these displacements are referred to as tunnel convergence. This report compares four dierent methods for monitoring tunnel convergence with regards to both measurement precision and method cost. READ MORE

  2. 2. Indoor and Outdoor Measurements of Particulate Matter with the Low-Cost Optical Sensor OPC-N3

    University essay from Lunds universitet/Kärnfysik; Lunds universitet/Fysiska institutionen

    Author : Ellen Grace Soroka; [2020]
    Keywords : Physics and Astronomy;

    Abstract : This paper evaluates the low-cost optical sensor OPC-N3 from Alphasense as a suitable scientific instrument for measuring particulate matter levels in air, both outdoors and in- doors. The time-keeping and data-retrieval was additionally improved by connecting the OPC-N3 to an Arduino microcontroller equipped with a real-time clock (RTC) module and an external SD card. READ MORE

  3. 3. I-V and Optical Characterization of InP/InAsP Quantum Disc-in-Nanowire Infrared Photodetectors

    University essay from Högskolan i Halmstad/Akademin för informationsteknologi

    Author : Divya Raval; [2019]
    Keywords : Nanowires; Infrared photodetectors; Quantum disc; Photocurrent;

    Abstract : Photodetectors are semiconductor devices capable of converting optical signals into electrical signals. There is a wide range of applications for photodetectors such as fiber optics communication, infrared heat camera sensors, as well as in medical and military equipment. READ MORE

  4. 4. Evaluation of a heated inlet to reduce humidity induced error in low-cost particulate matter sensors

    University essay from Lunds universitet/Ergonomi och aerosolteknologi

    Author : Piotr Czernicki; Mathias Kallmert; [2019]
    Keywords : particulate matter; optical particle counter; relative humidity; low-cost; pm sensor; heated inlet; Technology and Engineering;

    Abstract : The number of low-cost particulate matter (PM) sensors available on the market has increased in recent years. They are affordable, compact and require no maintenance which means they easily can be deployed and utilized for real-time air monitoring. However, the accuracy of low-cost PM sensors has been reported to vary depending on several factors. READ MORE

  5. 5. Field-effect transistor based biosensing of glucose using carbon nanotubes and monolayer MoS2

    University essay from Uppsala universitet/Molekyl- och kondenserade materiens fysik

    Author : Nathan Ullberg; [2019]
    Keywords : field-effect transistor; biosensor; glucose; carbon nanotube; MoS2; 1D materials; 2D materials; nanotechnology; FET;

    Abstract : As part of the EU SmartVista project to develop a multi-modal wearable sensor for health diagnostics, field-effect transistor (FET) based biosensors were explored, with glucose as the analyte, and carbon nanotubes (CNTs) or monolayer MoS2 as the semiconducting sensing layer.  Numerous arrays of CNT-FETs and MoS2-FETs were fabricated by photolithographic methods and packaged as integrated circuits. READ MORE