Inspection equipment by optical and acoustic analysis
Inspection equipment by optical and acoustic analysis

qmtmultisens offers an anechoic test environment combining different inspection methods with the possibility of manipulating the product. It is an acoustically isolated enclosure under controlled light. It allows the passage of the operator's hands, without degrading the acoustic insulation, to be able to handle the product while carrying out opto-acoustic analyses. The equipment is equipped with a camera that allows the product to be viewed for recording and processing. The system also records the acoustic signals emitted by the product synchronously with the image based on a time reference. The software allows the control and interfacing of the equipment in the customer's environment as well as the advanced analyzes of images and sounds.

The strengths of the QMTMultiSens:
  • Synchronized and high-sensitivity opto-acoustic measurements
  • Anechoic enclosure to isolate the product from the external environment
  • Handling the product while maintaining sound insulation
  • Software with acquisition, backup, replay and analyzes

A first example of application is in the field of high-end watchmaking for adjusting and checking chiming watches.

qmt customization programs
Fit For You (qmtF4U)
some products

some products

Workaround on

Solution according to specifications


Custom product
industrialized by qmt

QMTMultiSens technologies
an anechoic test environment combining different inspection methods with the ability to manipulate the product

In line with its strategy to provide Mechatronic Systems with Multiple Inspections (M 2 IS), QMTMultiSens is an anechoic test environment combining different inspection methods with the possibility of manipulating the device under test (DUT). In its first version, QMTMultiSens is configured for opto-acoustic analysis: it combines machine vision with acoustic acquisition and analysis.

Insulation of the product from noise and vibrations

In order to be able to analyze the acoustic characteristics of a device in a reproducible and reliable way, the use of an anechoic chamber (or "deaf chamber") is essential. This experimental environment has walls that absorb sound waves, thus not causing any echo that could disturb the measurements. The anechoic chamber is also isolated from acoustic disturbances coming from the outside, namely airborne and solid-borne noise: some vibrations are transmitted by the structure (walls, ceilings and floors) and others by air. The performances are aerial insulation (50dB), with complete decoupling, and structure-borne.

Handling the product while maintaining sound insulation

It is possible to pass the hands in the equipment to handle the product while maintaining the acoustic insulation. It is thus possible to characterize the acoustic and optical response of a product during its handling.

Optical system

The optical system consists of a 2 MPixel camera with a field of view of 105 x 60mm. Diffuse lighting allows the acquisition of high definition images or films.

The acoustic system

A high sensitivity sensor allows the acquisition of the acoustic signal from 6.5 to 80dB, with a bandwidth of 5Hz to 20kHz.

QMTMultiSens applications
Opto-acoustic characterization
Adjustment and control of chiming watches

A first example of application is in the field of high-end watchmaking, where the adjustment and control of chiming watches is a major challenge. Three main reasons make the task very complex:

  • The isolation of the watch from ambient noise and vibrations is not obvious
  • The faithful reproduction of the sounds produced by the watch, in a way that can be repeated by one piece of equipment or reproducible between several pieces of equipment, is complex
  • Handling and adjustment of the acoustically insulated watch can, in principle, only take place in an anechoic chamber

QMTMultiSens is therefore the table equipment adapted to a high-end manufacturing workshop and which meets these three needs. It allows the watchmaker to adjust the striking complication using an opto-acoustic measurement and analysis tool. Automatic quality control over different test durations is also feasible and easy. QMTMultiSens allows the analyzes below in an automatic or semi-automatic way:

  • Automatic time detection
  • Ring Duration Measurement
  • Detection of notes for hours, quarters (in the case of mechanisms with 3 gongs), as well as measured minutes
  • Measurement of hour/quarter intervals (3 gong mechanisms) or hour/minute intervals (2 gong mechanisms), as well as quarter/minute intervals (3 gong mechanisms)
  • Measurement of the sound level of the keystroke and its signal-to-noise ratio (SNR)
  • Note duration detection with statistical reports
  • Detection of notes for hours, quarters (in the case of mechanisms with 3 gongs), as well as measured minutes
  • Note tempo measurement
  • Sanction against the criteria defined by the operator
Other Apps

The equipment is versatile and can be adapted to other applications in watchmaking but also in other industries. The software functions needed by different applications will be added according to the needs of the applications.

QMTMultiSens software
Software for control, acquisition, backup, replay and analysis

The software makes it possible to control the whole as an autonomous system with the possibility of interfacing external commands or data exchanges with the customer's databases. It is one of the key elements of the system, as it is equipped with advanced means of image and sound analysis.

Product customization
The adaptation of a product according to your specific need
Personalization with the Fit For You (F4U) program

qmt products can be customized both from a hardware and software point of view. The first level of software customization is the addition of additional functions or the development of a personalized function. It is also possible to personalize the equipment, for example by modifying the field of vision or by adding episcopic lighting.

Your product with the OEM program

On the basis of qmt products, it is proposed the realization of labeled product in the name of our customers who can be private or marketed by themselves

“More than 100 systems are produced each year for a large number of customers”
List of References
QMTMultiSens Specifications
Optical and acoustic analysis control equipment
Functions QMTMultiSens QMTMultiSens-F4Y
Field of view [mm] 105 x 160 According to specifications
Optical resolution [Mpixels] 2 According to specifications
Acoustic measurements 6.5 to 80dB, with a bandwidth of 5Hz to 20kHz According to specifications
Soundproofing aerial (50dB), with complete decoupling, and solid According to specifications
Lighting Diffuse According to specifications
Measurement software QMTMultiSens According to specifications
Measurement cycles Manual and continuous with automatic event detection According to specifications
Signal processing Functions for controlling strike watches According to specifications
Computer science External PC in Windows 10 According to specifications
Dimensions (H x W x D) [mm]
(without computer)
580 x 650 x 680 According to specifications
Item code A260800002-01 -
More information on the minute repeater watch application with the presentation Detailed presentation
QMTMeasure software functions
All solutions are based on unique software functions

For optical control

To increase production yields
and the quality of the parts

For aesthetic control

For acoustic and vibration control

Control devices
Measurement and control at the edge of lines and in laboratories
qmt Creations
Five product lines

Acquisition and processing of signals with software, hardware, acquisition hardware and sensors

Autonomous, they are dedicated to measurement for control by sampling in production and for the laboratory

Completely automatic from the feeding of the parts to the control: any non-compliant part is thus ejected and therefore the quality control is 100% guaranteed

Embedded and distributed systems

They operate autonomously with acquisition, processing and control to supervise and automate

Test benches

physical systems allowing to put a product in configurable and controlled conditions of use in order to observe and measure its behavior