High Power Laser Doppler Monitor


High power tissue blood flow and temperature monitoring, enabling measurements from deeper tissues

  • We have found Moor equipment to be extremely dependable and innovative.

    Dean L. Kellogg, Jr., MD, Ph.D
    University of Texas Health Science Center

  • I cannot rate the company or the staff highly enough.

    Jim House, PhD
    University of Portsmouth

  • In a nutshell, moorFLPI-2 is the most user-friendly system for studying cerebral blood flow regulation in rodents.

    Chia-Yi (Alex) Kuan, MD, PhD
    Emory University School of Medicine

  • Moor Instruments have consistently provided excellent help and support for my research.

    Kim Gooding, PhD
    University of Exeter Medical School

  • Laser Doppler Imager is a standard accurate method we now use in our cerebral blood flow and brain perfusion in our laboratory.

    Momoh A. Yakubu, PhD
    Texas Southern University

  • We can't recommend Moor instruments highly enough. The technology is at the cutting edge and the support second to none.

    Paul Sumners, PhD
    London South Bank University

  • It goes without saying that the company's imaging technology itself is superb!

    Gourav Banerjee
    Leeds Beckett University

  • I expect to be using Moor Instrument’s technology for many years to come!

    Faisel Khan, PhD
    Ninewells Hospital & Medical School

The moorVMS-LDF1-HP is optimised specifically to enable measurements to be taken from the tissue surface down to deeper vascular beds than is otherwise provided by conventional laser Doppler systems.

The higher power in combination with wider separation of transmitting and receiving fibres in the probe head enable a larger volume to be monitored and also reduces site to site variations. The system is easily used with the standard moorVMS-LDF monitors to provide a comparison between deeper and more superficial changes.

For soft tissue we recommend the VP1-HP design which is fixed to the tissue with double sided adhesive discs. For bone measurements or surgical applications the VP7BS-HP needle design can be held in place either in a burr hole or by hand.

In addition we now offer a solution to allow combined deeper blood flow with surface tissue oxygen and temperature measurements, the CP1T-HP skin probe

PC software (moorVMS-PC) is available to offer simple statistics (such as average LD blood flow, standard deviation, min, max etc) as well as more formal assessments of cardiac pulse wave amplitude for example, useful where cardiac synchronous pulsatility, as well as amplitude, are used as indicators of vitality (femoral head assessments).

The following products are AVAILABLE TO BUY ONLINE and work with the moorVMS-LDF1-HP

This section lists the more common questions our customers have with regards to the moorVMS-LDF1-HP. If you have a question you would like answered that does not appear below then please email us. We are happy to help!

Q. What factors affect the penetration depth of a laser Doppler monitor?
A. There are several factors that affect the measurement depth of a laser Doppler monitor. The wavelength of the laser, power of the laser and separation of the fibres are all important. The design of the moorVMS-LDF1-HP uses a higher laser power and an exceptionally wide fibre separation to offer exceptional penetration.

Q. Is the moorVMS-LDF1-HP safe in normal use?
A. Yes. We take laser safety extremely seriously and all the safety equipment and training is provided to ensure correct use is observed at all times.

There are numerous references where our laser Doppler monitors are cited. The list below is a small selection. Please contact us for reference lists on your chosen subject.

Notzli HP, Siebenrock KA, Hempfi ng A, Ramseier LE, Ganz R.
Perfusion of the femoral head during surgical dislocation of the hip. Monitoring by laser Doppler flowmetry
J Bone Joint Surg Br. 2002 Mar;84(2):300-4

Bøgehøj M, Emmeluth C and Overgaard S.
Blood flow and microdialysis in the human femoral head.
Acta Orthopaedica 2007; 78 (1): 56–62

Clough G, Chipperfi eld A, Byrne C, Frits de Mul, Gush R.
Evaluation of a new high power, wide separation laser Doppler probe: potential measurement of deeper tissue blood flow.
Microvascular research, in press 2009

Moor Instruments are committed to product development. We reserve the right to change the specifications below without notice.


Laser Safety Classification
Class 3R per IEC 60825-1:2014
Output power 20mW max.
Wavelength 785nm ± 10nm
Angular spread of laser light from probe tip 26°
All specifications include cumulative measured uncertainties and expected increases in values after manufacture.


Accuracy: ± 10%, relative to Moor Instruments ‘standard’ moorVMS-LDF1-HP
Precision: ± 3% of measurement value
Range: 0-1000 PU

Accuracy: ± 10%
Precision: ± 5% of measurement value
Range: 0-1000AU

Accuracy: ± 10%
Precision: ± 3%
Range: 0-1000AU


Range 5-50°C
Resolution 0.1°C, accuracy ± 0.3°C


Bandwidth: high pass 20Hz
Low pass selectable 3KHz*, 15KHz, 22KHz*
Output time constants: 0.1s, 0.5s, 1.0s, 3.0s and unfiltered
Automatic gain control and zeroing

*Feature only available whilst using the moorVMS-PC Windows™ software


Digital LCD screen display
40Hz maximum data rate
0-1000 arbitrary perfusion units
USB interface for connection to PC
2 analogue outputs per channel, BNC sockets 0-5v


Flash memory programmable from PC
Output scale adjustment
Filter bandwidth selection


Universal voltage switch-mode power supply range 100-230v at 30VA, 50 to 60 Hz
Dimensions W H D mm
moorVMS-LDF1-HP 235 x 60 x 200
Weight kgs
moorVMS-LDF1-HP 1.4
Mode of operation: continuous.


Temperature 0-45°C
Humidity 0-80% RH
Atmospheric pressure 500-1060hPa
Type of protection against electric shock – Class 1
Degree of protection against electric shock – Type BF
Degree of protection against ingress of liquid – IPXO (not protected)
Degree of protection against flammable anaesthetics – equipment not suitable for use in the presence of flammable anaesthetics

Moor Instruments manufacture a wide range of probes designed to help you assess flow from almost any tissue. We are more than happy to advise on your particular application but hope too that the following general notes are useful.

The following is a list of recognised probes for use with the moorVMS-LDF1-HP.