ULTRASONIC SENSOR

                                   ULTRASONIC SENSOR

An ultrasonic sensor is an electronic device that measures the distance of a target object by emitting ultrasonic sound waves, and converts the reflected sound into an electrical signal. Ultrasonic waves travel faster than the speed of audible sound (i.e. the sound that humans can hear). Ultrasonic sensors have two main components: the transmitter (which emits the sound using piezoelectric crystals) and the receiver (which encounters the sound after it has travelled to and from the target).In order to calculate the distance between the sensor and the object, the sensor measures the time it takes between the emission of the sound by the transmitter to its contact with the receiver. The formula for this calculation is D = ½ T x C (where D is the distance, T is the time, and C is the speed of sound ~ 343 meters/second). For example, if a scientist set up an ultrasonic sensor aimed at a box and it took 0.025 seconds for the sound to bounce back, the distance between the ultrasonic sensor and the box would be:

D = 0.5 x 0.025 x 343

or about 4.2875 meters.

1st Editonal of International Conference on Sensing Technology | 23-24 Jan 2023 | India

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Laser Distance Sensor for Indoor and Outdoor Applications

 Laser Distance Sensor for Indoor and Outdoor Applications

If large distances have to be measured, whether indoors or outdoors, optoNCDT ILR2250-100-H laser distance sensors from Micro-Epsilon are used. The sensors are available with heating and cooling element and provide precise, stable results in measuring ranges of up to 150 m.

When displacement and distance must be determined over long distances with high accuracy, optoNCDT ILR2250 laser distance sensors provide reliable results. The sensors can be mounted both indoors and outdoors. For outdoor measurement tasks, laser distance sensors are available with integrated heating and cooling. This allows the sensors to be operated at temperatures from -40 °C to +65 °C. In addition, the aluminum die-cast housing is very robust.

1st Editonal of International Conference on Sensing Technology | 23-24 Jan 2023 | India

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Biosensors

Biosensors are devices used to detect the presence or concentration of a biological analyte, such as a biomolecule, a biological structure or a microorganism. Biosensors consist of three parts: a component that recognizes the analyte and produces a signal, a signal transducer, and a reader device.

A flexible pressure sensor with highly customizable sensitivity and linearity via positive design of micro hierarchical structures with a hyperplastic model:

The tactile pressure sensor is of great significance in flexible electronics, but sensitivity customization over the required working range with high linearity still remains a critical challenge. Despite numerous efforts to achieve high sensitivity and a wide working range, most sensitive microstructures tend to be obtained only by inverting naturally existing templates without rational design based on fundamental contact principles or models for piezoresistive pressure sensors. Here, a positive design strategy with a hyperelastic model and a Hertzian contact model for comparison was proposed to develop a flexible pressure sensor with highly customizable linear sensitivity and linearity, in which the microstructure distribution was precalculated according to the desired requirement prior to fabrication. As a proof of concept, three flexible pressure sensors exhibited sensitivities of 0.7, 1.0, and 1.3 kPa−1 over a linear region of up to 200 kPa, with a low sensitivity error (<5%) and high linearity (~0.99), as expected. Based on the superior electromechanical performance of these sensors, potential applications in physiological signal recognition are demonstrated as well, and such a strategy could shed more light on demand-oriented scenarios, including designable working ranges and linear sensitivity for next-generation wearable device

1st Editonal of International Conference on Sensing Technology | 23-24 Jan 2023 | India

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