CT Gantry Proximity Switch for Zero Position Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Computed tomography devices with tiltable frames face challenges in accurately detecting the zero position tilt angle, requiring precise detection methods that are often costly and complex.
Innovation Solution
A gantry system with a proximity switch and reference mark, allowing for contactless detection of the tilt angle approaching a reference angle, utilizing a capacitive, inductive, or optical proximity switch to achieve high accuracy without the need for expensive vibration damping or complex calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sensor systems are used to detect the tilt angle and zero position, then measurement precision can be achieved, but device complexity and cost increase due to required vibration damping and complex calibration
Solution Approach 1:
The patent replaces complex mechanical sensor systems with a simple proximity switch and reference mark system. Instead of using conventional tilt sensors that require vibration damping and calibration, the invention uses a proximity sensor to detect the position of a reference mark on the rotary frame, which naturally passes through a defined zero position during rotation. This mechanical-to-optical/electromagnetic substitution eliminates the need for complex calibration procedures and vibration damping mechanisms while maintaining high measurement precision for zero position detection.
Solution Approach 2:
The rotary frame's own rotational movement serves to bring the reference mark past the proximity sensor, creating a self-generating detection mechanism. The system utilizes the inherent motion of the rotary frame during normal operation to automatically provide the detection signal, eliminating the need for separate actuation mechanisms or complex calibration procedures. The zero position is detected naturally as the reference mark passes the sensor during rotation.
2Measurement precision
If conventional sensor systems are used to detect the tilt angle, then measurement precision can be achieved, but cost increases due to expensive vibration damping and calibration requirements
Solution Approach 1:
The patent employs inexpensive proximity switches and simple reference marks instead of costly conventional tilt sensors. The proximity sensor and reference mark constitute a low-cost detection system that eliminates the need for expensive vibration damping components and complex calibration equipment. This approach significantly reduces manufacturing costs while maintaining the required measurement precision for zero position detection in CT gantries.
3Measurement precision
If the proximity switch detects the approach to reference angle during tilting movement, then detection accuracy improves to within 0.1° or less, but the system requires precise positioning of the reference mark and sensor
Solution Approach 1:
The patent transitions from measuring tilt angle directly during tilting movement to detecting the zero position through the rotational movement of the rotary frame. By using the rotation of the rotary frame as an intermediate dimension, the system achieves high precision zero position detection without requiring extremely precise positioning of the reference mark relative to the tilt axis. The proximity sensor detects when the reference mark passes during rotation, providing accurate zero position reference with relaxed manufacturing tolerances.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise detection of the tilt angle with high accuracy, typically within 0.1° or less, at lower costs compared to traditional methods, facilitating efficient initialization and operation of computed tomography devices.
Implementation Method 1
utilizing a capacitive, inductive, or optical proximity switch
Implementation Method 2
utilizing a capacitive, inductive, or optical proximity switch
Implementation Method 3
utilizing a capacitive, inductive, or optical proximity switch
Data Source
AI summary
In a gantry for a computed tomography device, a rotary frame is arranged on the tilt frame so that the rotary frame rotates relative to the tilt frame about an axis of rotation. The tilt frame is arranged on the support frame so that the tilt frame tilts about a tilt axis relative to the support frame, such that a tilt angle of the tilt frame relative to the support frame is changeable by a tilting movement of the tilt frame relative to the support frame about the tilt axis. The proximity switch has a proximity sensor and a reference mark, which interacts with the proximity sensor. The proximity switch is also coupled to the support frame and to the tilt frame such that the proximity switch is configured to react to an approach of the tilt angle to a reference angle.