Table of Contents
What sensors do trains use?
Sensors for Rail Applications
- Speed Sensors.
- Vibration Sensors.
- Pressure Sensors.
- Humidity Sensors.
- Position Sensors.
- Temperature Sensors.
- Level Sensors.
Are there sensors on train tracks?
A defect detector is a device used on railroads to detect axle and signal problems in passing trains. The detectors are normally integrated into the tracks and often include sensors to detect several different kinds of problems that could occur.
What is train detection?
Thus, the ability to detect the presence of a train on a particular stretch of track is a key enabler for automatic signalling, and hence modern train control. There are two types of technology generally used for train detection, a track circuit or an axle counter.
How railway tracks are checked?
Visual inspection or ‘walking the track’ is one of the most common methods of track inspection. A track recording vehicle (TRV) is a mechanised method of railway track inspection while using optical and inertial sensors in a specialised vehicle.
What is hot box detector?
operation is the infrared “hotbox detector,” which, located at trackside, detects the presence of an overheated wheel bearing and alerts the train crew. The modern hotbox detector identifies the location in the train of the overheating and, employing synthesized voice recording, radios the details to the train crew.
How Track circuits detect and protect trains?
Track circuits operational principle is based on an electrical signal impressed between the two running rails. The presence of a train is detected by the electrical connection between the rails, provided by the wheels and the axles of the train (wheel-to-rail shunting).
What is railway track circuit?
A track circuit itself is an electrical system that detects the absence of a train on a section of track. This information then helps the signalling system know if it’s safe for another train to proceed.
What are the different types of railroad crossings?
There are two types of crossings–private and public. Private crossings are not required to have advance signs or other markings and are found on roadways not maintained by public authority.
How are infrared sensors used to detect trains?
Coded pulsed infrared proximity sensors for detecting model trains on the track. Pulsing (modulation) allows the detector to ignore ambient lighting. Coded pulsing allows each detector to ignore the IR signals of other nearby detectors.
How are ultrasonic sensors used at railway crossings?
The Ultrasonic sensors are used to detect the train arrival and departure. The Servo Motors are used to open and close the railway gates. The LED lights are used as traffic signals at railway crossing and the Buzzer signal is used to warn the vehicles about the train arrival. Fig 1. Block diagram of proposed system.
What kind of ultrasound is used for train detection?
Ultrasound is just as resistant to snow, and mist as it is to dust and exhaust gases. The train detection devices in the ZHS series from HNC combine a microwave sensor and an ultrasonic sensor. The combined sensor package is usually installed on the display board itself or under the platform roof.
What does coded pulsing do to a train detector?
Coded pulsing allows each detector to ignore the IR signals of other nearby detectors. May be used as a reflective detector (sensors in the roadbed) or as an interrupt detector (detector looks across the track).