Tag Archives: Dissipation

openQCM NEXT Tech Specs

openQCM NEXT

Physical quantities: Frequency and Dissipation
Measurement mode: Simultaneous multi - overtones (up to 9th @ 5 MHZ)
Minimum Sampling time: ~ 125 ms for each harmonic
Frequency sensitivity: ± 1 Hz
Dissipation sensitivity: ~ 0.1 x 10-6

Nominal working range: 15 °C - 45 °C
Control direction: Heating and Cooling
TEC element: Peltier

Number of sensors: Single
Sensor frequencies: 5 MHz and 10 MHz
Blank diameter: 14mm
Contact electrodes: Wrapped (Single side contact)

Default Fluidic module material: Nichel electroplating Stainless steel (top cover exposed to the sample) , Flash chrome plating Aluminium (bottom)
Fluidic module window material: Quartz glass, Viton (FKM) oring and PTFE sealing
Heat sink material: Flash chrome plating Aluminium
Main case material: Aluminum 6061 and Nylon plastic PA2200
Main Dimension: (L x W x H): 20 x 8 x 4 cm
Fluidic module dimensions: (L x W x H): 2.5 x 2.5 x 0.5 cm
Weight: 260 g

Main electronics: USB 5VDC powered (cable included)
Peltier module: 5 VDC through 220/110 VAC adaptor (adaptor 220VAC - 5VDC USB included)

Control unit core: Teensy 4.0 based on ARM Cortex-M7 at 600 MHz, Float point math unit, 64 & 32 bits 1984K Flash, 1024K RAM (512K tightly coupled) 1K EEPROM (emulated)Stainless steel, aluminum
Programming language: C++ arduino - language based code

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openQCM NEXT Electronics

openQCM NEXT

A Network Analyzer QCM shield

As for the Q-1 the openQCM NEXT electronics mainly consists of a network analyzer that passively interrogates the quartz sensor by sweeping around its resonance frequency.

The actuation signal is generated using the AD9851 DDS/DAC frequency synthesizer and the output signal is read by AD8302 gain and phase detector, which can measure both the magnitude ratio (gain) across the quartz crystal and the phase difference between the actuation and output signals. The analysis of the gain curve allows the characterization of the sensor by measuring simultaneously the resonance frequency and quality factor. The main advantage of the scheme of measurement is the possibility to measure quartz sensor parameters in isolation without external circuity influences.NEXT

Teensy 4.0 inside its heart

openQCM Q^-1 is controlled by the powerful Teensy 4.0 (developed by Paul Stoffregen) , that mounts a ARM CortexM7 brings many powerful CPU features to a true real-time microcontroller platform. So, CPU performance is many times faster than typical 32 bit microcontrollers. The high clock speed drastically increase the ADC sampling time and the resolution of the measurements.

ACTIVE THERMAL CONTROL

Onboard the main electronics is mounted a miniaturised, safe and very high accuracy complete Peltier single-module controller: MTD415 (by Thorlabs). The MTD415T is a compact and highly integrated temperature controller optimized for use in high performance thermoelectric temperature control applications. The on-chip power stage and the thermal control loop circuitry minimize external components while maintaining high efficiency.

The output current is directly controlled to eliminate current surges. An adjustable TEC current limit provides the highest level of TEC protection. The MTD415T is operated from a single power supply and provides a bipolar ±1.5 A output by connecting the TEC to the output of a bipolar
power stage. True bipolar operation ensures temperature control without “dead zones” or other non linearities at low TEC current values. These TEC controllers deliver powers up to 6 W and a maximum TEC current of ±1.5 A.
The TEC controller supports a 10 kΩ thermistor, integrated in the Sensor Module of openQCM NEXT.

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openQCM NEXT Design

openQCM NEXT

We have kept in mind thermal performances by designing each mechanical component of openQCM NEXT from scratch

OpenQCM NEXT design is the synthesis of all feedback received from the scientific community. We have come up with a characteristic bridge design, realised with the aim of maximising the thermal dissipation and electrical interferences of the electronics. The sensor module has been replaced with a custom heat sink, in which it is embedded a PTFE “slot”, housing the fluidic module. The fluidic module is the real holder of the quartz sensors, made to be a multi-purpose accessory

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SENSOR MODULE

The Sensor Module is designed to maximise electrical ad thermal performances of openQCM NEXT. Its main body is the effective heatsink of the system. All other mechanical components are totally embedded in the main body. We designed a PFTE slot that acts acontinuity thermal interface between cold and hot side of the Peltier element. The slot is further designed in order to have an effective plug and play mechanical and electrical connection of the fluidic module. All materials were carefully selected to ensure the broadest chemical compatibility with the samples to be analysed.

More than a simple holder

The fluidic module is the real core of openQCM NEXT. Composed of two metal parts: the lower part, made of electropolished aluminium will be in direct contact with the Peltier element, and the upper part, composed of Nickel electroplated stainless steel (or PTFE where the samples are particularly sensitive to interactions with metals). All other materials are specifically selected in order to have the widest range of chemical compatibility with your samples. The fluidic circuit is directly engraved inside the top cover of the module, in order to enhance thermalisation of the incoming fluid. Furthermore we inserted a silica glass window for visual or spectroscopic inspection. If you need for specific spectral bandwidth, silica window, can be easily removed, in order to be replaced with your own optical window. Furthermore the fluidic module is designed as a plug-ad-play accessory that can be easily unplugged for treatments “out of the device” (eg: ultrasonic bath, thermal baking etc.)

inlet and outlet

Inlet and outlet lines, enter in the measurement chamber with a
specific tilting angle, in order to reduce flow perturbation
effects on the baseline (eg.: peristaltic waves), mainly during the
pumping phase.

See below!

Just below the bottom quartz surface, a 10K thermistor monitors the internal temperature of the fluidic module. Electrical contact pads on its microPCB are produced by immersion gold technique.
This process, drastically reduce the oxidation effects and consequently a degradation of S/N
with the time.

a SIMPLE GESTURE FOR PIPETTING

The heatsink The system is designed to be tiltable and facilitate its use for pipetting.

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About openQCM NEXT

openQCM NEXT

The open Source QCM with temperature Control and multiple overtones measurement

openQCMNEXT is the advanced Quartz Crystal Microbalance with dissipation monitoring, active temperature control and the capability to acquire multiple overtones simultaneously.
The instrument design is completely re-engineered, by using new materials which take into account the chemical compatibility with most of the samples.

: Quartz Crystal Microbalance with dissipation monitoring, active thermal control and simultaneous multiple overtone measurement shole vision

: Quartz Crystal Microbalance with dissipation monitoring, active thermal control and simultaneous multiple overtone measurement back view

: Quartz Crystal Microbalance with dissipation monitoring, active thermal control and simultaneous multiple overtone measurement side view and tilted heatisink

: Quartz Crystal Microbalance with dissipation monitoring, active thermal control and simultaneous multiple overtone measurement side view

We have kept in mind thermal performances by designing each mechanical component of openQCM NEXT from scratch

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openQCM Q-1 Tech Specs

openQCM Q^-1

Dimensions: 143.1 x 66.8 x 26 mm
Weight: 50 g
Case Material: Nylon

Materials: PMMA or PTFE
Other materials: upon request
14 mm internal volume: 50 µL
25.4 mm internal volume: 200 µL (above the sensor)
O-ring: FKM

Materials: PMMA or PTFE
Other materials: upon request
Sample volume: range from 10 μl to 100 μl
O-ring: FKM

Standard Quartz Frequencies: 5 MHz and 10 MHz
Maximum Quartz Frequency: compatible with DDS Frequency output range (50 MHz)
Hosting diameter: 14 mm and 25.4 mm (1 inch)
Electrodes configuration: single side contact
Quartz sensors contacts: pogo-pin
Overtones Capability: YES (see measurement specs)

Frequency Monitoring: YES
Frequency Resolution: 1 Hz (minimum)
Dissipation Monitoring: YES
Dissipation Resolution: 10^-6 (minimum)
Overtones Analyses: YES
Overtones for 5 MHz quartz: up to 9^th overtone
Overtones for 10 MHz quartz: up to 5^th overtone
Measurement Mode: air, static liquid and flow liquid

Power Supply: 5 VDC
Electrical Connection: USB

AD9851 - DDS/DAC Synthesizer
DDS Frequency Output Range: DC to 51 MHz
DDS Clock Rate: 120 MHz
DDS Voltage Supply: 3.3 VDC
AD8302: RF/IF Gain and Phase Detector
Input Frequency Range: 0 - 2700 MHz
Gain Measurement Range: ± 30 dB
Phase Measurement Range: ± 90 Degree
Supply Voltages: from 2.7 V – 5.5 V
AD5252 Dual 256-Pos Digital Potentiometer
Resistance: 1 kOhm
I2C-compatible serial interface
Single supply 2.7 V to 5.5 V

Teensy 3.6 dev board
Processor: MK66FX1M0VMD18
Core: Cortex-M4F
Rated Speed: 180 MHz
Digital I/O: 58 pins
Voltage Input: 3V3 only (not 5VDC tolerant)
Analog Input: 25 pins
Analog Bits Usable Resolution 13 Bits
USB Communication
I2C Communications: 4 Pins
Serials UART: 6
Programming Language: Arduino Compatible

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openQCM Q-1 Design

openQCM Q^-1

A new concept design of Quartz Crystal Microbalance with dissipation monitoring, that takes into account the wider research needs.

We designed the device into separate modules: a main electronic unit and a fluidic cell module. Starting from today, you will be able to independently modify one of the subsystems without the need to change the whole device.

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One simple gesture to mount it

The main electronics case is composed of 2 elements produced in 3D printing. With an innovative slot locking system, 2 simple screws are sufficient to ensure compactness and protection for the electronics. An ergonomic design ensures maximum handling for an instrument that was born to be portable.

One cell for all devices

The new openQCM fluidic cell module was born after more than three years of confrontation with the scientific community and is the synthesis of the most important needs we have experienced:

– pogo-pin sensor contacts;
– multi quartz dimension compatibility;
– multi-frequency housing compatibility;
– fine regulation of O-ring; pressure;
– Integrated temperature sensor;
– magnetic backreaction to sealing;

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openQCM Q-1 Electronics

openQCM Q^-1

A Network Analyzer QCM shield

The openQCM Q^-1 electronic mainly consists of a network analyzer that passively interrogates the quartz sensor by sweeping around its resonance frequency.

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Teensy 3.6 inside its heart.

openQCM Q^-1 mounts the powerful Teensy 3.6 ( developed by Paul Stoffregen) , a 32 bit Arduino compatible board using a 180 MHz ARM Cortex-M4 with Floating Point Unit. The high clock speed and the 32-bit technology drastically increase the ADC sampling time and the resolution of the measurements. This isa more advanced board which is well suited for more complex projects, also thanks to its micro SD card port mounted onboard.

openQCM has now unlimited extension possibilities for the Research.

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About openQCM Q-1

openQCM Q^-1

The first open-hardware scientific inStrument ready for soft matter Research

openQCM Q^-1 is the first QCM open hardware instrument suitable for simultaneously Frequency and Dissipation monitoring in a wide range of overtones. A surface sensitive technology for monitoring mass variations and viscoelastic properties at molecular scale.

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Sweeping around resonance frequency

How openQCM Q^-1acquires resonance curves in order to monitor the dissipation effect.

We designed keeping in mind the concept of modularity

The modular design give us the maximum flexibility for future improvements. For example, it would be easier to modify the original main electronic design, based on the feedback coming from the scientific community, without the need to change the whole device.

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Measurement Specs

Thermal Control

Sensors

Hardware and Material Specification

Power

Microprocessor

A Network Analyzer QCM shield

Teensy 4.0 inside its heart

ACTIVE THERMAL CONTROL

We have kept in mind thermal performances by designing each mechanical component of openQCM NEXT from scratch

More than a simple holder

inlet and outlet

See below!

a SIMPLE GESTURE FOR PIPETTING

The open Source QCM with temperature Control and multiple overtones measurement

Quartz Crystal Micobalance

Multiple Overtones

DDS sweep technology

Built-in Temperature Control

Fludic Module

Multi frequency compatibility

We have kept in mind thermal performances by designing each mechanical component of openQCM NEXT from scratch

Case Dimension & Materials

Fluidic window

Open Window

Quartzes Compatibility

Measurement Specifications

Electrical

Electronic

Microcontroller

One cell for all devices

A Network Analyzer QCM shield

simultaneous frequency, dissipation and phase measurements

integrated digital potentiometer

I2C capability for easy sensors integration

Expansion slot for custom shields

USB for mechanical and electrical interfacing

plug & play device

Teensy 3.6 inside its heart.

The first open-hardware scientific inStrument ready for soft matter Research

Sweeping around resonance frequency

simultaneous frequency, dissipation and phase measurements

overtones analyses

o-ring pressure fine regulation

pogo pins sensor contacts

multi quartz hosting

DDS sweep technology

Expansion slot for custom shields

We designed keeping in mind the concept of modularity

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