diff --git a/content/zettels/force_sensors.md b/content/zettels/force_sensors.md
index b5f786f..53a57bf 100644
--- a/content/zettels/force_sensors.md
+++ b/content/zettels/force_sensors.md
@@ -4,25 +4,32 @@ author = ["Thomas Dehaeze"]
 draft = false
 +++
 
-Backlinks:
-
--   [Signal Conditioner]({{< relref "signal_conditioner" >}})
--   [Sensors]({{< relref "sensors" >}})
--   [Nanopositioning system with force feedback for high-performance tracking and vibration control]({{< relref "fleming10_nanop_system_with_force_feedb" >}})
--   [Collocated Control]({{< relref "collocated_control" >}})
--   [Instrumented Hammer]({{< relref "instrumented_hammer" >}})
--   [Position Sensors]({{< relref "position_sensors" >}})
-
 Tags
 : [Signal Conditioner]({{< relref "signal_conditioner" >}}), [Modal Analysis]({{< relref "modal_analysis" >}})
 
 
+## Technologies {#technologies}
+
+There are two main technique for force sensors:
+
+-   piezoelectric technology
+-   strain gauge technology
+
+The choice between the two is usually based on whether the measurement is static (strain gauge) or dynamics (piezoelectric).
+
+Main differences between the two are shown in Figure [1](#orgc54ca38).
+
+<a id="orgc54ca38"></a>
+
+{{< figure src="/ox-hugo/force_sensor_piezo_vs_strain_gauge.png" caption="Figure 1: Piezoelectric Force sensor VS Strain Gauge Force sensor" >}}
+
+
 ## Piezoelectric Force Sensors {#piezoelectric-force-sensors}
 
 
 ### Dynamics and Noise of a piezoelectric force sensor {#dynamics-and-noise-of-a-piezoelectric-force-sensor}
 
-An analysis the dynamics and noise of a piezoelectric force sensor is done in ([Fleming 2010](#org9ffb699)) ([Notes]({{< relref "fleming10_nanop_system_with_force_feedb" >}})).
+An analysis the dynamics and noise of a piezoelectric force sensor is done in ([Fleming 2010](#org3b3fec8)) ([Notes]({{< relref "fleming10_nanop_system_with_force_feedb" >}})).
 
 
 ### Manufacturers {#manufacturers}
@@ -55,4 +62,4 @@ However, if a charge conditioner is used, the signal will be doubled.
 
 ## Bibliography {#bibliography}
 
-<a id="org9ffb699"></a>Fleming, A.J. 2010. “Nanopositioning System with Force Feedback for High-Performance Tracking and Vibration Control.” _IEEE/ASME Transactions on Mechatronics_ 15 (3):433–47. <https://doi.org/10.1109/tmech.2009.2028422>.
+<a id="org3b3fec8"></a>Fleming, A.J. 2010. “Nanopositioning System with Force Feedback for High-Performance Tracking and Vibration Control.” _IEEE/ASME Transactions on Mechatronics_ 15 (3):433–47. <https://doi.org/10.1109/tmech.2009.2028422>.
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